Update app.py

app.py

@@ -120,7 +120,13 @@ def load_midi(input_midi, melody_patch=-1):
         zscore = TMIDIX.recalculate_score_timings(sp_escore_notes)
 
     else:
-        zscore = TMIDIX.recalculate_score_timings([e for e in sp_escore_notes if e[6] == melody_patch])
+        mel_score = [e for e in sp_escore_notes if e[6] == melody_patch]
+
+        if mel_score:
+            zscore = TMIDIX.recalculate_score_timings(mel_score)
+
+        else:
+            zscore = TMIDIX.recalculate_score_timings(sp_escore_notes)
     
     cscore = TMIDIX.chordify_score([1000, zscore])