Fixed git-subrepo and tests if set ff=only #640
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Some tests failed, when ff_only is set in users git configuration; like:
...
test/branch-rev-list-one-path.t .... Died at line 23 in main of test/branch-rev-list-one-path.t
test/branch-rev-list-one-path.t .... No subtests run
test/branch-rev-list.t ............. Died at line 26 in main of test/branch-rev-list.t
test/branch-rev-list.t ............. No subtests run ...
and git configuration is set like:
$ git config --global pull.ff only
$ git config --global merge.ff only
There may be a similar cause of failure described in issue 550.