"randommovie" broken due to external API

[spotlightishere]

I'm too tired to make up another story like I did in #14 and #15.

The randommovie command does not currently work due.
It currently produces

Exception: #<NoMethodError: undefined method `sub' for nil:NilClass>

from https://github.com/Seriell/Yuuki-Bot/blob/b38537499fbede11d8a7e5c040f272274d71ede0/modules/extra/json_cmds.rb#L299

This is due to the API it's using returning an entirely different response about needing an API key from another API. A chain of APIs and one failed. ;-;

I created an issue on the server's repo to see how the author would like to work around this.