Fixed example bugs

Event listener "input" doesn't work on examples input, so unused input boxes aren't clear. Fixed by specifying unused value to blank.

app.py

@@ -39,8 +39,9 @@ with gr.Blocks(css="#htext span {white-space: pre-line}") as demo:
                         elem_id="htext",
                         label="Summary",
                     )
-                ctrlsum_file_examples = gr.Examples(examples=[["examples/H01-1042_body.txt", 50, "automatic evaluation technique"],["examples/H01-1042.pdf", 0, "automatic evaluation technique"]],
-                                                inputs=[ctrlsum_file, ctrlsum_file_length, ctrlsum_file_keywords])
+                ctrlsum_file_examples = gr.Examples(examples=[["examples/H01-1042_body.txt", 50, "automatic evaluation technique", "",""],["examples/H01-1042.pdf", 0, "automatic evaluation technique","",""]],
+                                                inputs=[ctrlsum_file, ctrlsum_file_length, ctrlsum_file_keywords, ctrlsum_str, ctrlsum_url])
+