Results: Fix db save where results do not correspond to scenario.

src/Model/Results/Results.py

@@ -351,7 +351,7 @@ class Results(SQLSubModel):
 
     def _db_save(self, execute, data=None):
         if self._status.scenario.id != self._owner_scenario:
-            return
+            return True
 
         pid = self._pamhyr_id
         if self._solver is None: