When loading documents from a different wiki, objects are loaded with the wrong class

From BaseCollection:

if (wiki == null) {
    context.getWiki();
}

The line inside the if block does not do anything, the name of the wiki is left null, and further down in the method the current wiki is set to the wiki variable, thus the contextual wiki is lost.

The code should be:

if (wiki == null) {
    wiki = context.getDatabase();
}