Fix bug when prompt is none (#456) (#458)
Fix bug when prompt is none (#456) (#458)


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