Replace TypeError with KeyError in remote webdriver error handler code

[dveselov]

Hi!

Looks like that there is a typo (because dictionary lookup code, in that case, can't raise TypeError)

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[isaulv]

@dveselov Thank you for your contribution!
Actually we can improve this code and save a few precious microseconds with this change, remove the try/except and replace it with:
message = message.get('message')

[AutomatedTester]

could you change this to instead of being a try.. except be

message = message.get('message')

[dveselov]

Done.

[isaulv]

I would recommend to leave out None because None is already the default.

[dveselov]

uh, ok.