Do not emit data modified after pipeline finishes

There is a new datasource every time now, so this is not necessary.
Additionally, this is causing crashing when closing the application
when operators are present, and it is also causing crashing
occasionally when deleting datasources that have operators.

Signed-off-by: Patrick Avery <patrick.avery@kitware.com>

Author: psavery

tomviz/PipelineModel.cxx

@@ -777,14 +777,6 @@ void PipelineModel::dataSourceAdded(DataSource* dataSource)
   connect(pipeline, &Pipeline::operatorAdded, this,
           &PipelineModel::operatorAdded, Qt::UniqueConnection);
 
-  // Fire signal to indicate that the transformed data source has been modified
-  // when the pipeline has been executed.
-  // TODO This should probably be move else where!
-  connect(pipeline, &Pipeline::finished, [this, pipeline]() {
-    auto transformed = pipeline->transformedDataSource();
-    emit dataSourceModified(transformed);
-  });
-
   // When restoring a data source from a state file it will have its operators
   // before we can listen to the signal above. Display those operators.
   foreach (auto op, dataSource->operators()) {