Martin von Zweigbergk <martinvonz@google.com> [Sun, 02 Nov 2014 13:18:08 -0800] rev 23147
largefiles: simplify check for lack of path arguments
Instead of checking for a partial merge by checking that the matches
has no files and no patterns, check that it's not an
always-matcher. Except for being shorter, it also catches the rare
case of an exact-matcher with no files.