Update app.py

app.py

@@ -81,7 +81,7 @@ if app_choice == "🔁 Protein Repeat Finder":
         return new_repeats
 
     def get_or_process_sequence(sequence, analysis_type, overlap=50):
-        if not results_collection:
+        if results_collection is None:
             return {}
 
         hash_input = f"{sequence}_{analysis_type}"