Update app.py

app.py

@@ -262,7 +262,8 @@ def phylogenetic_placement(sequence: str, mafft_cmd: str, iqtree_cmd: str):
                 os.unlink(query_fasta)
             except Exception as cleanup_error:
                 logger.warning(f"Failed to clean up {query_fasta}: {cleanup_error}")
-        return False, f"Error: {str(main_error)}", None, Nonedef analyze_sequence_for_tree(sequence: str, matching_percentage: float):
+        return False, f"Error: {str(main_error)}", None, None 
+def analyze_sequence_for_tree(sequence: str, matching_percentage: float):
     try:
         logger.debug("Starting tree analysis...")
         if not analyzer: