Feature settings of a building seem to be lost after saving multiple images #126
Description
In the admin, adding a new building and filling fields in a certain order seems to have unintended effects.
For example if the inline feature fields of a building (M2M) are set and saved and in a second step images are added in bulk via the images admin, the feature settings seem to be lost.
Couldn't reproduce it by now but it happens from time to time in production, it feels like the fields get overriden by empty values again.