catching classes that do not inh

修改python3源码：

class MobileErrorHandler(errorhandler.ErrorHandler):

def check_response(self, response):

try:

super(MobileErrorHandler, self).check_response(response)

except WebDriverExceptionas wde:

if wde.msg =='No such context found.':

raise NoSuchContextException(wde.msg, wde.screen, wde.stacktrace)

else:

raise wde

修改为：

class MobileErrorHandler(errorhandler.ErrorHandler, BaseException):

def check_response(self, response):

try:

super(MobileErrorHandler, self).check_response(response)

except WebDriverExceptionas wde:

if wde.msg =='No such context found.':

raise NoSuchContextException(wde.msg, wde.screen, wde.stacktrace)

else:

raise wde