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Bug fixes:
- Handle cases where the __parent__ of a discussion was not set to the migrated DX object.
[pbauer] (566)
- In the edge case where the meta_type could not be resolved assume is_folderish being false.
[pbauer] (567)
- Fixed problems in ``getMimeTypeIcon``.
The contentType of the file was ignored, and icon paths could have a duplicate ``++resource++mimetype.icons/``.
[maurits] (569)