Tests: avoid version import error when run from bare git clone
Tests: avoid version import error when run from bare git clone

Unit tests can inject the local bcbio cloned environment which does
not have a version. This fixes errors by effectively ignoring
the version check for this case. Fixes #2515

vladsaveliev/bcbio-nextgen,vladsaveliev/bcbio-nextgen,lbeltrame/bcbio-nextgen,lbeltrame/bcbio-nextgen,lbeltrame/bcbio-nextgen,a113n/bcbio-nextgen,chapmanb/bcbio-nextgen,chapmanb/bcbio-nextgen,chapmanb/bcbio-nextgen,vladsaveliev/bcbio-nextgen,a113n/bcbio-nextgen,a113n/bcbio-nextgen