fix: make audio input components interactive based on model availability

app.py

@@ -206,7 +206,8 @@ with gr.Blocks(title="Real-time Speech-to-Text with NeMo") as demo:
                         sources=["microphone"], 
                         type="numpy", 
                         streaming=True,
-                        label="Speak into your microphone"
+                        label="Speak into your microphone",
+                        interactive=(model is not None)
                     )
                     
                 clear_btn = gr.Button("Clear Transcript", variant="secondary")
@@ -230,7 +231,8 @@ with gr.Blocks(title="Real-time Speech-to-Text with NeMo") as demo:
                     audio_recorder = gr.Audio(
                         sources=["microphone"],
                         type="filepath",
-                        label="Record or upload audio file"
+                        label="Record or upload audio file",
+                        interactive=(model is not None)
                     )
                     with gr.Row():
                         transcribe_btn = gr.Button("Transcribe Audio File", variant="primary")