Snapping file_line to 1, since some tools report general errors as line 0.
NOTE: We don't do any any math with num_lines since this is mainly to handle general file errors (maybe there should be a "general comment" for files as well as review requests?).

NOTE: "Comment on unmodified code" will need to be selected if line 1 wasn't changed.

Before change -> error displaying diff

After change -> Comments on line 1 if allowed, otherwise passes.