To reproduce :
1. Open project attached by user
2. In asset folder right click mouse and select import new asset
3. Select "texture.jpg" file to be imported
4. In inspector window add new asset bundle name
5. Open meta file of this imported asset and notice that there is no saved asset bundle name

Expected result : Asset bundle name is saved after adding it to the imported asset.
Actual result : Name is not being saved. After making a basic change to this asset - everything is saved as it should.

Reproducible on : 5.5.0f3, 5.6.0f3, 5.6.0p3, 2017.1.0b2
Not reproducible on : 5.4.0f3, 5.4.4p4,

Note : This issue does not appear when setting asset bundle name to the prefabs like cube, plain etc.

Fixed in : 2017.1.0b6
Backported to : 5.5.3p4, 5.6.1p1