Feature/fix download hander failed

[p0psicles]

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[marceloid]

Hi, first of all I'm very new to Open Source, so excuse any mistake.

Describe the bug
This PR introduced this line of code on lines 311-312 on medusa/clients/torrent/generic.py.

if not self.response:
            return False, 'Unable to connect to {name}'.format(name=self.name)

After this PR, when I fill all the fields on Search settings > Torrents search and click "Test connection", the message "Unable to connect to transmission" appears.

It happens that self.response with self.response.status_code == 409 evalutes to False, so the test_authentication() method returns False. The 409 response occurs because of the need for the X-Transmission-Session-Id header for transmission to return a 200 response.

I've commented these two lines and it worked flawlessly, and the method self.__get_auth() would return self.response.status_code == 200.

I've tested on branch master and develop on commits 8dfa74c and 658c6e8 respectively.

My python version is 3.8.10.

Did I do something wrong or is it a undesirable side effect of the PR?

[p0psicles]

I'll add an exception for the 409