Fix AttributeError when searching a remote by name

[cesarizu]

Running code like 'origin' in git.Repo('path/to/existing/repository').remotes
raises an AttributeError instead of returning a boolean. This commit fixes that
behaviour by catching the error when doing an identity match on IterableList.

Minimum test case with version 2.1.11:

>>>'origin'ingit.Repo('path/to/existing/repository').remotesTraceback (mostrecentcalllast):
File"<stdin>", line1, in<module>File"/home/cesar/.local/lib/python3.7/site-packages/git/util.py", line867, in__contains__rval=list.__contains__(self, attr)
File"/home/cesar/.local/lib/python3.7/site-packages/git/remote.py", line451, in__eq__returnself.name==other.nameAttributeError: 'str'objecthasnoattribute'name'

[Byron]

It looks like a single test fails, and I would trust that it is indeed genuine.
Maybe you have some ideas why that would be.
Thanks for your help!

[cesarizu]

I just tried that same test on master and I still see the failure. Also, it doesn't touch the IterableList#__contains__ function (modified in this PR) at all, so it seems unrelated. Or am I missing something here?

[codecov-io]

Codecov Report

Merging #862 into master will increase coverage by 1.06%.
The diff coverage is n/a.

@@ Coverage Diff @@## master #862 +/- ##
==========================================
+ Coverage 93.6% 94.66% +1.06% 
==========================================
Files 59 59 Lines 9769 9389 -380 ==========================================
- Hits 9144 8888 -256 + Misses 625 501 -124

Impacted Files	Coverage Δ
git/index/util.py	90.69% <0%> (-0.61%)	⬇️
git/index/typ.py	96.82% <0%> (-0.58%)	⬇️
git/objects/tag.py	81.08% <0%> (-0.5%)	⬇️
git/test/test_config.py	98.33% <0%> (-0.47%)	⬇️
git/objects/tree.py	59.64% <0%> (-0.36%)	⬇️
git/objects/base.py	95.83% <0%> (-0.33%)	⬇️
git/refs/tag.py	96.66% <0%> (-0.31%)	⬇️
git/test/test_remote.py	97.54% <0%> (-0.3%)	⬇️
git/refs/reference.py	95.74% <0%> (-0.26%)	⬇️
git/refs/symbolic.py	96.11% <0%> (-0.14%)	⬇️
... and 29 more

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[cesarizu]

In any case, I've just rebased the branch and it's all green now.

[Byron]

Thanks a bunch!