fix package_check() for bogus versions
fix package_check() for bogus versions

vlukes/sfepy,rc/sfepy,RexFuzzle/sfepy,vlukes/sfepy,sfepy/sfepy,sfepy/sfepy,lokik/sfepy,BubuLK/sfepy,rc/sfepy,BubuLK/sfepy,BubuLK/sfepy,RexFuzzle/sfepy,sfepy/sfepy,vlukes/sfepy,lokik/sfepy,lokik/sfepy,RexFuzzle/sfepy,RexFuzzle/sfepy,lokik/sfepy,rc/sfepy