message: hub/data-source: Remove duplicate `_writer` assignment
diff: @@ -7,7 +7,6 @@ module.exports = class DataSource {
  constructor(model, plugins, projectPath) {
  this.id = model.id;
  this.sourceType = model.attributes['source-type'];
  - this._writer = null;
  this._params = Object.assign({ dataSource: this }, model.attributes.params);
  this._Writer = plugins.lookupFeatureFactory('writers', this.sourceType);
  this._writer = null;
  