[PATCH] git: fix handling of git submodule links with incomplete configuration

[Valentin Kleibel]

Hi,

We recently noticed that submodule links in a git repo which are not 
correctly referenced in .gitmodules will produce a "500 Server Error".

The Error also breaks search indexing and likely some other functions.

To reproduce just add a submodule in a git repo, rm .gitmodules and 
commit this change.

If a git object is a submodule link kallithea tries to resolve the 
submodule url via the repos' .gitmodules file. A missing file, missing 
section or a missing url for that submodule will raise either KeyError 
or ValueError in kallithea/lib/vcs/backends/git/changeset.py lines 
402-403 and 441-442.

Attached is a patch to catch these errors and set url=None in this case.

Valentin
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