added audio check in predict function

app.py

@@ -35,6 +35,10 @@ run_cmd('pip -q install pydub')
 from pydub import AudioSegment
 
 def predict(audio_file_path):
+    if(audio_file_path == None):
+        output = "Please record your voice using the record button before submitting :)"
+        return output, {}, ""
+    
     input_data = open(audio_file_path, 'rb').read()
     print(len(input_data))