normalizeSingleResponse( store, primaryModelClass, payload, id, requestType ) {
		const key = this.modelNameFromPayloadKey();
		const data = payload[ key ] = payload[ key ][0];
		if ( !data ) {
			throw new Error( "Missing data while normalizing single response" );
		}

		return this._super( store, primaryModelClass, payload, id, requestType );
	}
Turn Twitch's array response into a single response
@param {DS.Store} store
@param {DS.Model} primaryModelClass
@param {Object} payload
@param {string|null} id
@param {string} requestType
@return {Object}