Abandon any open changes if a project has been removed

If the Git repository has been deleted and a change has been
submitted in that repository MergeOp will contiuously try to
submit changes in that project, failing on every attempt when
openRepository() fails.

Catch this failure and abandon all changes in the project, as the
Git data no longer exists.

Change-Id: I83087211b281c1e478c0e83b48b8f7d158a93c13
1 file changed