TST: openfmri: Handle get() exception raised by upcoming datalad

[kyleam]

test_openfmri_pipeline2() fails in datalad/datalad#5163 (NF: AnnexRepo.call_annex*()) because get() now raises an exception if the git-annex-get call fails.

https://github.com/datalad/datalad/runs/1517140012

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cc @mih

[codecov[bot]]

Codecov Report

Merging #87 (728c6ff) into master (5d06a4a) will decrease coverage by 0.02%. The diff coverage is 60.00%.

@@            Coverage Diff             @@
##           master      #87      +/-   ##
==========================================
- Coverage   81.40%   81.37%   -0.03%     
==========================================
  Files          57       57              
  Lines        4652     4656       +4     
==========================================
+ Hits         3787     3789       +2     
- Misses        865      867       +2     

Impacted Files	Coverage Δ
datalad_crawler/pipelines/tests/test_openfmri.py	88.49% <60.00%> (-0.63%)	:arrow_down:

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[yarikoptic]

thank you @kyleam !