Failed to access wiki when the descriptor is not stored in the object number 0 of the document

To reproduce:

• in the main wiki descriptor, add an alias and remove the default alias added (or something like that, just make sure that the descriptor of the wiki is not object with number 0 but with number 1 or 2 or something, and that there is no object with number 0 of type XWikiServerClass)
  • I also had my server in domain based but I don't think it matters
• restart the wiki
• access the wiki, you will have the following error displayed on the screen and won't be able to access the wiki:

  root cause
  
  com.xpn.xwiki.XWikiException: Error number 11007 in 0: Failed to extract Entity Resource Reference from URL [<server url here>]
  	com.xpn.xwiki.XWiki.initializeResourceFromURL(XWiki.java:519)
  	com.xpn.xwiki.XWiki.getXWiki(XWiki.java:468)
  	com.xpn.xwiki.web.XWikiAction.execute(XWikiAction.java:173)
  	com.xpn.xwiki.web.XWikiAction.execute(XWikiAction.java:149)
  	org.apache.struts.action.RequestProcessor.processActionPerform(RequestProcessor.java:425)
  	org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:228)
  	org.apache.struts.action.ActionServlet.process(ActionServlet.java:1913)
  	org.apache.struts.action.ActionServlet.doGet(ActionServlet.java:449)
  	javax.servlet.http.HttpServlet.service(HttpServlet.java:621)
  	javax.servlet.http.HttpServlet.service(HttpServlet.java:728)
  	com.xpn.xwiki.web.ActionFilter.doFilter(ActionFilter.java:115)
  	org.xwiki.wysiwyg.server.filter.ConversionFilter.doFilter(ConversionFilter.java:126)
  	org.xwiki.container.servlet.filters.internal.SavedRequestRestorerFilter.doFilter(SavedRequestRestorerFilter.java:208)
  	org.xwiki.container.servlet.filters.internal.SetCharacterEncodingFilter.doFilter(SetCharacterEncodingFilter.java:111)
  	org.tuckey.web.filters.urlrewrite.RuleChain.handleRewrite(RuleChain.java:176)
  	org.tuckey.web.filters.urlrewrite.RuleChain.doRules(RuleChain.java:145)
  	org.tuckey.web.filters.urlrewrite.UrlRewriter.processRequest(UrlRewriter.java:92)
  	org.tuckey.web.filters.urlrewrite.UrlRewriteFilter.doFilter(UrlRewriteFilter.java:394)
  	org.tuckey.web.filters.urlrewrite.NormalRewrittenUrl.doRewrite(NormalRewrittenUrl.java:213)
  	org.tuckey.web.filters.urlrewrite.RuleChain.handleRewrite(RuleChain.java:171)
  	org.tuckey.web.filters.urlrewrite.RuleChain.doRules(RuleChain.java:145)
  	org.tuckey.web.filters.urlrewrite.UrlRewriter.processRequest(UrlRewriter.java:92)
  	org.tuckey.web.filters.urlrewrite.UrlRewriteFilter.doFilter(UrlRewriteFilter.java:394)
  
  root cause
  
  java.lang.NullPointerException
  	org.xwiki.wiki.internal.descriptor.builder.DefaultWikiDescriptorBuilder.extractWikiAlias(DefaultWikiDescriptorBuilder.java:156)
  	org.xwiki.wiki.internal.descriptor.builder.DefaultWikiDescriptorBuilder.extractWikiDescriptor(DefaultWikiDescriptorBuilder.java:142)
  	org.xwiki.wiki.internal.descriptor.builder.DefaultWikiDescriptorBuilder.buildDescriptorObject(DefaultWikiDescriptorBuilder.java:102)
  	org.xwiki.wiki.internal.descriptor.DefaultWikiDescriptorManager.buildDescriptorFromDocument(DefaultWikiDescriptorManager.java:214)
  	org.xwiki.wiki.internal.descriptor.DefaultWikiDescriptorManager.getByAlias(DefaultWikiDescriptorManager.java:146)
  	org.xwiki.url.internal.standard.DefaultWikiReferenceExtractor.getWikiDescriptorByAlias(DefaultWikiReferenceExtractor.java:179)
  	org.xwiki.url.internal.standard.DefaultWikiReferenceExtractor.resolveDomainBasedWikiReference(DefaultWikiReferenceExtractor.java:126)
  	org.xwiki.url.internal.standard.DefaultWikiReferenceExtractor.extract(DefaultWikiReferenceExtractor.java:95)
  	org.xwiki.url.internal.standard.entity.ExtendedURLEntityResourceReferenceResolver.resolve(ExtendedURLEntityResourceReferenceResolver.java:92)
  	org.xwiki.url.internal.standard.entity.ExtendedURLEntityResourceReferenceResolver.resolve(ExtendedURLEntityResourceReferenceResolver.java:59)
  	org.xwiki.url.internal.standard.StandardURLResourceReferenceResolver.resolve(StandardURLResourceReferenceResolver.java:121)
  	org.xwiki.url.internal.standard.StandardURLResourceReferenceResolver.resolve(StandardURLResourceReferenceResolver.java:45)
  	org.xwiki.url.internal.DefaultResourceReferenceResolver.resolve(DefaultResourceReferenceResolver.java:75)
  	org.xwiki.url.internal.DefaultResourceReferenceResolver.resolve(DefaultResourceReferenceResolver.java:45)
  	com.xpn.xwiki.XWiki.initializeResourceFromURL(XWiki.java:515)
  	com.xpn.xwiki.XWiki.getXWiki(XWiki.java:468)
  	com.xpn.xwiki.web.XWikiAction.execute(XWikiAction.java:173)
  	com.xpn.xwiki.web.XWikiAction.execute(XWikiAction.java:149)
  	org.apache.struts.action.RequestProcessor.processActionPerform(RequestProcessor.java:425)
  	org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:228)
  	org.apache.struts.action.ActionServlet.process(ActionServlet.java:1913)
  	org.apache.struts.action.ActionServlet.doGet(ActionServlet.java:449)
  	javax.servlet.http.HttpServlet.service(HttpServlet.java:621)
  	javax.servlet.http.HttpServlet.service(HttpServlet.java:728)
  	com.xpn.xwiki.web.ActionFilter.doFilter(ActionFilter.java:115)
  	org.xwiki.wysiwyg.server.filter.ConversionFilter.doFilter(ConversionFilter.java:126)
  	org.xwiki.container.servlet.filters.internal.SavedRequestRestorerFilter.doFilter(SavedRequestRestorerFilter.java:208)
  	org.xwiki.container.servlet.filters.internal.SetCharacterEncodingFilter.doFilter(SetCharacterEncodingFilter.java:111)
  	org.tuckey.web.filters.urlrewrite.RuleChain.handleRewrite(RuleChain.java:176)
  	org.tuckey.web.filters.urlrewrite.RuleChain.doRules(RuleChain.java:145)
  	org.tuckey.web.filters.urlrewrite.UrlRewriter.processRequest(UrlRewriter.java:92)
  	org.tuckey.web.filters.urlrewrite.UrlRewriteFilter.doFilter(UrlRewriteFilter.java:394)
  	org.tuckey.web.filters.urlrewrite.NormalRewrittenUrl.doRewrite(NormalRewrittenUrl.java:213)
  	org.tuckey.web.filters.urlrewrite.RuleChain.handleRewrite(RuleChain.java:171)
  	org.tuckey.web.filters.urlrewrite.RuleChain.doRules(RuleChain.java:145)
  	org.tuckey.web.filters.urlrewrite.UrlRewriter.processRequest(UrlRewriter.java:92)
  	org.tuckey.web.filters.urlrewrite.UrlRewriteFilter.doFilter(UrlRewriteFilter.java:394)