sort error lines in unknown format to the top

Author: mkurnikov

pytest_mypy/utils.py

@@ -167,10 +167,13 @@ def remove_empty_lines(lines: List[str]) -> List[str]:
 def sorted_by_file_and_line(lines: List[str]) -> List[str]:
     def extract_parts_as_tuple(line: str) -> Tuple[str, int, str]:
         if len(line.split(':', maxsplit=2)) < 3:
-            return ('', 0, '')
+            return '', 0, ''
 
         fname, line_number, contents = line.split(':', maxsplit=2)
-        return fname, int(line_number), contents
+        try:
+            return fname, int(line_number), contents
+        except ValueError:
+            return '', 0, ''
     return sorted(lines, key=extract_parts_as_tuple)