Cleanup some code in add_clauses
Cleanup some code in add_clauses

cjdrake/pyeda,sschnug/pyeda,cjdrake/pyeda,GtTmy/pyeda,pombredanne/pyeda,karissa/pyeda,GtTmy/pyeda,sschnug/pyeda,GtTmy/pyeda,pombredanne/pyeda,sschnug/pyeda,karissa/pyeda,pombredanne/pyeda,cjdrake/pyeda,karissa/pyeda