fix: UnboundLocalError: local variable 'local_server' referenced befo…

[rasa]

…re assignment

In Oct. 2022 gyb worked fine on a Windows 10 system. Today I got

UnboundLocalError: local variable 'local_server' referenced before assignment

This PR fixes the issue. Surprisingly, it took 840 ports to find one that would work:

...
839: 127.0.0.1:8918: [WinError 10013] An attempt was made to access a socket in a way forbidden by its access permissions
840: 127.0.0.1:8919: [WinError 10013] An attempt was made to access a socket in a way forbidden by its access permissions

Go to the following link in your browser:

        https://gyb-shortn.jaylee.us/example

[rasa]

This is still an issue with 1.74. Perhaps it's just my machine, but please consider accepting this PR, as it can't hurt, and can only help others like me. Thanks.