fix e2e_webui (#658)

* fix e2e_webui

* [pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

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Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>

tools/e2e_webui.py

@@ -65,8 +65,6 @@ async def process_audio_input(
     elif text_input:
         sr = 44100
         sys_audio_data = None
-    else:
-        raise gr.Error("Invalid audio format")
 
     def append_to_chat_ctx(
         part: ServeTextPart | ServeVQPart, role: str = "assistant"