check for self._executor in Execute
check for self._executor in Execute

amyxchen/openhtf,google/openhtf,jettisonjoe/openhtf,grybmadsci/openhtf,fahhem/openhtf,grybmadsci/openhtf,ShaperTools/openhtf,fahhem/openhtf,jettisonjoe/openhtf,fahhem/openhtf,google/openhtf,grybmadsci/openhtf,ShaperTools/openhtf,ShaperTools/openhtf,google/openhtf,ShaperTools/openhtf,google/openhtf,jettisonjoe/openhtf,fahhem/openhtf,jettisonjoe/openhtf,amyxchen/openhtf,ShaperTools/openhtf,grybmadsci/openhtf