adding a catcher for the case that the current entity type is no...

...t present in the requested entity types.

Use Case, we are on a shot:
If the show current selection only knob was on in loader getting sth from the shot entity, and one switches to a loader that only queries assets and sequences, they wont show up at all.

Now there is a check to see if the current entity is present in the queried entities and uses the check button then, 
if not the other entities get displayed accordingly.

Cheers
Johannes