fix problems with compatibility caused when the delete key would fail its lookup and clear() op would be skipped
fix problems with compatibility caused when the delete key would fail its lookup and clear() op would be skipped

songxiang321/ios-monkey,misfitdavidl/tuneup_js,alexvollmer/tuneup_js,alexvollmer/tuneup_js,MYOB-Technology/tuneup_js,MYOB-Technology/tuneup_js,songxiang321/ios-monkey,Northern01/tuneup_js,misfitdavidl/tuneup_js,Northern01/tuneup_js