set to `None` for empty Textbox values

modules/whisper/faster_whisper_inference.py

@@ -63,6 +63,14 @@ class FasterWhisperInference(WhisperBase):
         if params.model_size != self.current_model_size or self.model is None or self.current_compute_type != params.compute_type:
             self.update_model(params.model_size, params.compute_type, progress)
 
+        # None parameters with Textboxes: https://github.com/gradio-app/gradio/issues/8723
+        if not params.initial_prompt:
+            params.initial_prompt = None
+        if not params.prefix:
+            params.prefix = None
+        if not params.hotwords:
+            params.hotwords = None
+
         params.suppress_tokens = self.format_suppress_tokens_str(params.suppress_tokens)
 
         segments, info = self.model.transcribe(