Intersect entities in solutions break entity loader

[rappen]

If a solution contains a M:M-relationship it breaks adding items to the listview.
The UserLocalizedLabel of M:M-intersect entities is null, which causes this line to break:
https://github.com/MscrmTools/MsCrmTools.Translator/blob/master/MsCrmTools.Translator/MainControl.cs#L265

Adding null tolerance solves it.

Not sure if these "entities" should be included, and not sure if this bug is introduced by a change in the platform, by creating the relationship in the Maker Portal, or something else...