Diff does not work if file does not exist in HEAD

[michaeladler]

If I want to review an old commit of a file that no longer exists in HEAD, vim-git-log silently returns and does nothing. My solution was to remove the problematic code part:

if !filereadable(l:repo . '/' . l:filename)
    execute 'cd ' . l:cwd
    return
endif

At the very least you should use echom and warn the user about that behavior, but personally I don't see a reason why that check should exist in the first place.