Improve log name when no location selected in the asset move form

[paul121]

Describe the bug
Normally when the asset move action is used to move an asset to a new location the location names are included in the activity log: Move {assets} to {locations}. But if no locations are selected in the form we use the same logic to build the log name, which ends up with an incomplete Move {assets} to log name.

To Reproduce
Steps to reproduce the behavior:

1. Go to assets page
2. Click on an asset, select the "Move asset" action
3. Complete the form without a location
4. See new activity log with incomplete name

Expected behavior
We should name these logs better. Perhaps Reset {asset} location. ?

Screenshots

[paul121]

We just decided on the dev call for this language to be Clear {asset} location.