Do not display message that table is empty

Issue-Ref: 4061
Issue-Url: https://af3-developer.fortiss.org/issues/4061



Signed-off-by: Simon Barner <barner@fortiss.org>

org.fortiss.tooling.common.ui/src/org/fortiss/tooling/common/ui/javafx/control/treetableview/.ratings

@@ -5,7 +5,7 @@ DynamicTreeContentProviderBase.java 0f6e0a6894752d135847608bc45efa504972bb28 GRE
 DynamicTreeItem.java 7486071d20e896d6ca9a9101bf105caccf3656d0 GREEN
 DynamicTreeItemBase.java d883066ecc181120302ca32f328538de7a45b093 GREEN
 DynamicTreeTableUIProviderBase.java 1078bd28a6bce5a5a2c60500f2aa1d8b1fdd341b GREEN
-DynamicTreeTableViewer.java ea4ac3530edfa179cfce53bdd7e3a7ae80c435e4 GREEN
+DynamicTreeTableViewer.java d5f12bda6fa19b4ada3bddf9b7320c3e5393cdf7 YELLOW
 DynamicTreeUIProviderBase.java 82d3c051213f0147f4c67ad247a08696cee73110 GREEN
 DynamicTreeViewer.java e58d2cf7239e45f1b790ce9770a8a8649b1b5fb9 GREEN
 DynamicTreeViewerBase.java a2013538b62d86f6a09efdf2cd78babac2072484 GREEN

org.fortiss.tooling.common.ui/src/org/fortiss/tooling/common/ui/javafx/control/treetableview/DynamicTreeTableViewer.java

@@ -23,6 +23,7 @@ import java.util.function.Supplier;
 import java.util.stream.Stream;
 
 import javafx.beans.property.SimpleObjectProperty;
+import javafx.scene.control.Label;
 import javafx.scene.control.SelectionMode;
 import javafx.scene.control.TreeItem;
 import javafx.scene.control.TreeTableColumn;
@@ -97,6 +98,7 @@ public final class DynamicTreeTableViewer<T> extends DynamicTreeViewerBase<T> {
 		view.setRoot(rootItem);
 		view.setShowRoot(showRoot);
 		view.setEditable(true);
+		view.setPlaceholder(new Label(""));
 		view.setRowFactory(new Callback<TreeTableView<T>, TreeTableRow<T>>() {
 			@Override
 			public TreeTableRow<T> call(TreeTableView<T> param) {