BlogPostList macro generates invalid XHTML which causes editing issues when used in a page in the wysiwyg editor

The following issues were observed when trying to use the blogpostlist macro from the wysiwyg editor:

• when used in a "box" macro and this is the only content of the page and then the page is edited in wysiwyg and saved, the whole content of the page is deleted upon save from wysiwyg edit mode
• when used in a "box" macro and there is other content in the page and then the page is edited in wysiwyg and saved, some of the content of the page is deleted upon save (a version of the page with less content is saved, the old content is still accessible from the history if it was saved before)
• when used directly in the page, extra content is added at the end of the page when the macro is added from or updated in the wysiwyg editor - this is not actually related to the valid HTML and so will be handled in a different ticket, see BLOG-194 .

This may not reproduce for all combination parameters of the macro, it reproduces at least for:

• the image layout mode - all problems
• the full layout mode - last problem