Update pyrebase.py to enable capturing metadata with service account enabled

[lewismunene020]

Recently while working with the delete feature in pyrebase in added the service account which enabled the credentials in Storage object.

Therefore the upload was being established but i got this error ; TypeError: 'NoneType' object is not subscriptable where metadata was not being returned since its used the blob.upload_from_file(file_obj) return None

        elif self.credentials:
            blob = self.bucket.blob(path)
            if isinstance(file, str):
                return blob.upload_from_filename(filename=file)
            else:
                 return blob.upload_from_file(file_obj=file)
        else:
            request_object = self.requests.post(request_ref, data=file_object)
            raise_detailed_error(request_object)
            return request_object.json()

Moving this code :+1:

            request_object = self.requests.post(request_ref, data=file_object)
            raise_detailed_error(request_object)
            return request_object.json()

inside the else statement located in the elif self.credentials made it to return the metadata pretty well when uploading a file object

Check it out if possible merge it . It really helped me out