bug fixing

app.py

@@ -828,12 +828,12 @@ def process_input(smiles_input=None, file_obj=None, show_linear=False,
         smiles = smiles_input.strip()
         
         if not analyzer.is_peptide(smiles):
-            return "Error: Input SMILES does not appear to be a peptide structure.", None, None
+            return "Error: Input SMILES does not appear to be a peptide structure.", None, None, []
                 
         try:
             mol = Chem.MolFromSmiles(smiles)
             if mol is None:
-                return "Error: Invalid SMILES notation.", None, None
+                return "Error: Invalid SMILES notation.", None, None, []
             
             if generate_3d:
                 generator = PeptideStructureGenerator()
@@ -857,7 +857,7 @@ def process_input(smiles_input=None, file_obj=None, show_linear=False,
                         structure_files.append(uff_path)
                 
                 except Exception as e:
-                    return f"Error generating 3D structures: {str(e)}", None, None, None
+                    return f"Error generating 3D structures: {str(e)}", None, None, []
                 
             segments = analyzer.split_on_bonds(smiles)
             
@@ -985,12 +985,12 @@ def process_input(smiles_input=None, file_obj=None, show_linear=False,
                         output_text += f"Peptide Cycles: {', '.join(peptide_cycles)}\n"
                     output_text += "-" * 50 + "\n"
             
-            return output_text, None, None
+            return output_text, None, None, []
             
         except Exception as e:
-            return f"Error processing file: {str(e)}", None, None
+            return f"Error processing file: {str(e)}", None, None, []
     
-    return "No input provided.", None, None
+    return "No input provided.", None, None, []
 
 iface = gr.Interface(
     fn=process_input,