Toolchain-Utils: Fix bug when no files to lint/check

This CL fixes a bug in the previous one editing pre-submit which caused
presubmit to fail when no new files have been added.

TEST=created new branches, confirmed presubmit is run correctly

Change-Id: I1a1b968220e60db12d05bbdab25646bfe2eb42e0
Reviewed-by: George Burgess <>
Reviewed-by: Caroline Tice <>
Tested-by: Emma Vukelj <>
1 file changed