Tests: Create CollectionState after MultiWorld.worlds (#4949)

BaseClasses.py

@@ -736,6 +736,7 @@ class CollectionState():
     additional_copy_functions: List[Callable[[CollectionState, CollectionState], CollectionState]] = []
 
     def __init__(self, parent: MultiWorld, allow_partial_entrances: bool = False):
+        assert parent.worlds, "CollectionState created without worlds initialized in parent"
         self.prog_items = {player: Counter() for player in parent.get_all_ids()}
         self.multiworld = parent
         self.reachable_regions = {player: set() for player in parent.get_all_ids()}