preventing errors

app.py

@@ -19,6 +19,7 @@ with open("height_estimator_0.pickle", "rb") as file:
     female_clf = pickle.load(file)
 
 article_md = Path("Description.md")
+error_message = "No speech detected or signal too short!"
 
 
 def read_markdown_file(file_path):
@@ -39,11 +40,13 @@ def get_speech(wav):
 
 
 def estimate_height(gender, vad, filepath, imperial):
+    if filepath is None:
+        return error_message
     signal = read_audio(filepath)
     if vad:
         signal = get_speech(signal)
         if len(signal) < 1:
-            return f"No speech detected or signal too short!"
+            return error_message
 
 
     embedding = torch.squeeze(classifier.encode_batch(signal), 0)