fix: Resolve bug with writing no extra args

When prompting for extra args, if no arguments were given, it would pass
an empty string to subprocess which would throw an error about a
pathspec issue. This resolves by doing a special check to see if the
string returned by the extra args check is empty.

Author: nebbles

gitcommit/gitcommit.py

@@ -399,7 +399,11 @@ def run():
         argv_passthrough = sys.argv[1:]  # overwrite default list
     existing_args = " ".join(argv_passthrough)
     text = Ansi.colour(Ansi.fg.bright_yellow, "Extra args for git commit: ")
-    argv_passthrough = prompt(ANSI(text), default=existing_args).split(" ")
+    extra_args_str = prompt(ANSI(text), default=existing_args)
+    if extra_args_str != "":
+        argv_passthrough = extra_args_str.split(" ")
+    else:
+        argv_passthrough = []
 
     # Ask for confirmation to commit
     confirmation_validator = YesNoValidator(answer_required=True)