The filters of the Tests Evolution gadget are not being saved

Sometimes (it doesn't happen every time) the filters of the Tests Evolution gadget are not saved.

Steps to Reproduce:

1. Create a new gadget
2. Select a test execution in the TE filter
3. All OK
4. Add a filter to the Test filter
5. No tests found
6. Try to correct, impossible since the Test filter is empty but somehow kept in memory.