Do not create range query with no enemies

Do not create range query with no enemies as that triggers warning in range manager.
This situation occurs when player has no enemies so empty list is returned.

Fixing CCmpRangeManager: No owners in query for entity 0 warning

refs rP23012

Differential Revision: https://code.wildfiregames.com/D2601
Fixes: #5666
Reviewed by: @Freagarach