Vim: loosen up update-bundle.sh script
Vim: loosen up update-bundle.sh script

Updating YouCompleteMe can be a bit of a pain due to its use of
submodues; for example you can run into errors like:

> Fetching submodule third_party/waitress
> You are not currently on a branch. Please specify which
> branch you want to merge with. See git-pull(1) for details.
>
>     git pull <remote> <branch>
>
> Stopping at '.vim/bundle/YouCompleteMe';
> script returned non-zero status.

So, let's just blindly carry on in that case, because we'll end up
checking out the same old rev anyway later in the script.

wincent/wincent,wincent/wincent,wincent/wincent,wincent/wincent,wincent/wincent,wincent/wincent,wincent/wincent,wincent/wincent