remove unused _try_delete()
remove unused _try_delete()

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