Tumblr Extractor returns 401 due to lack of api_key check in _call

[drunk-moe]

I was able to fix this by editing the extractor/tumblr.py and adding the same if self.api_key check that's in _pagination. Not sure if anything else needs to be changed so I don't want to open a PR :') but thought it might

    def _call(self, endpoint, params, **kwargs):
        url = self.ROOT + endpoint
        kwargs["params"] = params
        if self.api_key:
            params["api_key"] = self.api_key

Let me know if anything else is needed.