fix: handle non-dict types for overlapped_items in MultiHopSpecificQuerySynthesizer

- Updated logic to check if overlapped_items is a dictionary before extracting keys.
- Ensured compatibility with non-dict types for overlapped_items.

Author: alex-graber-pmi

src/ragas/testset/synthesizers/multi_hop/specific.py

@@ -81,7 +81,11 @@ async def _generate_scenarios(
                 overlapped_items = []
                 overlapped_items = triplet[1].properties[self.relation_overlap_property]
                 if overlapped_items:
-                    themes = list(dict(overlapped_items).keys())
+                    themes = (
+                        list(overlapped_items.keys())
+                        if isinstance(overlapped_items, dict)
+                        else overlapped_items
+                    )
                     prompt_input = ThemesPersonasInput(
                         themes=themes, personas=persona_list
                     )