Allow editing out the user

markdownrunner.py

@@ -142,10 +142,11 @@ def user_action(hunk: Sequence[Command], context=None) -> Sequence[Command]:
 			tmpfile.file.seek(0)
 			new_hunk = []
 			for line in tmpfile.file.readlines():
-				line = line.strip()
 				if line == '':
 					continue
 				parts = line.split('\t', maxsplit=2)
+				# Change user to None if it is not specified
+				parts[0] = parts[0].strip() if parts[0].strip() != '' else None
 				# Change directory to None if it is not specified
 				parts[1] = parts[1].strip() if parts[1].strip() != '' else None
 				new_hunk.append(Command(user=parts[0],directory=parts[1],command=parts[2],context=None))