Update app.py

Add in conditional when the user specifies no-op.

app.py

@@ -407,7 +407,11 @@ class RavenDemo(gr.Blocks):
 
             previous_num_calls += len(function_call_list)
 
-        relevant_places = self.get_relevant_places(results)
+        try:
+            relevant_places = self.get_relevant_places(results)
+        except:
+            relevant_places = self.get_relevant_places([])
+
         gmaps_html = self.get_gmaps_html(relevant_places[0])
         places_dropdown_choices = self.get_place_dropdown_choices(relevant_places)
         places_dropdown = gr.Dropdown(