list all when none, add trailing comma

app.py

@@ -29,7 +29,7 @@ def filter_languages(search_text, selected_languages):
     last_term = search_terms[-1] if search_terms else ""
     
     # Filter available languages
-    filtered = [lang for lang in all_languages if last_term.lower() in lang.lower() and lang not in selected_list]
+    filtered = [lang for lang in all_languages if last_term == "" or (last_term.lower() in lang.lower() and lang not in selected_list)]
     return gr.update(choices=filtered)
 
 def add_language(selected_language, selected_languages):
@@ -38,7 +38,7 @@ def add_language(selected_language, selected_languages):
     selected_list = selected_languages.split(",") if selected_languages else []
     if selected_language not in selected_list:
         selected_list.append(selected_language)
-    return ",".join(selected_list)
+    return "" if len(selected_list) == 0 else ",".join(selected_list)+","
 
 
 with gr.Blocks() as demo: