[scripts] fix a bug in run_chooser when no search results are found

scripts/copy-crosscode-emoji-url

@@ -61,6 +61,7 @@ def emote_downloader_and_iterator():
 chosen_index = common_script_utils.run_chooser(
     emote_downloader_and_iterator(), prompt="emote", async_read=True
 )
+if chosen_index >= 0:
     chosen_emote = emotes[chosen_index]
 
     emote_url = urllib.parse.urlparse(chosen_emote["url"])

scripts/query-bookmarks

@@ -110,6 +110,7 @@ chosen_index = common_script_utils.run_chooser(
     chooser_entries_iter(), prompt="bookmark"
 )
 
+if chosen_index >= 0:
     _title, url, _folder_path_str = chooser_entries[chosen_index]
     print(url)