function _getConnectorConfigByLayer(sLayer) {
		if (!sLayer) {
			return Promise.reject("No layer was provided");
		}
		return _getWriteConnectors()
		.then(findConnectorConfigForLayer.bind(this, sLayer));
	}
Determines the connector in charge for a given layer.

@param {string} sLayer - Layer on which the file should be stored
@returns {Promise<sap.ui.fl.write.connectors.BaseConnector>} Returns the connector in charge for the layer or rejects in case no connector can be determined