Fix: Avoid runtime error when candidate is empty.

app.py

@@ -18,8 +18,11 @@ def load_conette(*args, **kwargs) -> CoNeTTEModel:
     return conette(*args, **kwargs)
 
 
-def format_cand(cand: str) -> str:
-    return f"{cand[0].title()}{cand[1:]}."
+def format_candidate(candidate: str) -> str:
+    if len(candidate) == 0:
+        return ""
+    else:
+        return f"{candidate[0].title()}{candidate[1:]}."
 
 
 def get_results(
@@ -136,7 +139,7 @@ def main() -> None:
         audio_fnames, cands = get_results(model, audios, generate_kwds)
 
         for audio_fname, cand in zip(audio_fnames, cands):
-            st.success(f"**Output for {audio_fname}:**\n- {format_cand(cand)}")
+            st.success(f"**Output for {audio_fname}:**\n- {format_candidate(cand)}")
 
     if len(record) > 0:
         outputs = model(
@@ -145,7 +148,7 @@ def main() -> None:
         )
         cand = outputs["cands"][0]
         st.success(
-            f"**Output for {osp.basename(record_fpath)}:**\n- {format_cand(cand)}"
+            f"**Output for {osp.basename(record_fpath)}:**\n- {format_candidate(cand)}"
         )