Fix some login exceptions

[mirusu400]

It seems that twitter checks account duplication, but not always.
We can check this by subtasks from response json object, but just pass the exceptions should be work too.

[Ryu1845]

If we're going to ignore the the error I'd rather use an if statement i.e.

output_flow = request_flow.json()
if "flow_token" in output_flow.keys():
    self.flow_token = output_flow["flow_token"] 

[sonarqubecloud]

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