Fix crashes when opening Submodules.

[psineur]

Subj, [theRepository workingDirectory] was nill &

index = [[PBGitIndex alloc] initWithRepository:theRepository workingDirectory:[NSURL fileURLWithPath:[theRepository workingDirectory]]];

in the PBGitCommitController's -initWithRepository:superController:

[psineur]

Just copypasted this from line 169 -readFromURL:ofType:error:

[psineur]

Hah, this made them rare, but still possible to crash.
I've found that i have crash, when opened a submodule.

PBGitRepository than have fileURL like
file://localhost/PATH_TO_REPO/.git/modules/SUBMODULE_FOLDER/PATH/

so there's no "/.git" suffix and "rev-parse --is-inside-work-tree" command returns false.

[psineur]

Ok, now -workingDirectory can not return nil.
Only if self.fileURL is nil.

[stigi]

Would love to see a version with this PR merged

[psineur]

If current master branch is unstable, here's this PR applied to 0.8.4 : https://github.com/psineur/gitx/tree/psineur

[dannybabiy]

Thanks psineur, the patch resolved a crash i was having as well

[jordanandree]

this resolved the submodule crash for me as well, thanks @psineur