Add marking ImplicitGeometry to GeometryNode's text

CityDoctorParent/Extensions/CityDoctorGUI/src/main/java/de/hft/stuttgart/citydoctor2/gui/tree/GeometryNode.java

 package de.hft.stuttgart.citydoctor2.gui.tree;
 
 import de.hft.stuttgart.citydoctor2.datastructure.Geometry;
+import de.hft.stuttgart.citydoctor2.datastructure.ImplicitGeometryHolder;
 import de.hft.stuttgart.citydoctor2.gui.CheckStatus;
 import de.hft.stuttgart.citydoctor2.gui.Renderer;
 
@@ -12,6 +13,9 @@ public class GeometryNode extends Renderable {
 	public GeometryNode(Geometry geom) {
 		this.geom = geom;
 		StringBuilder sb = new StringBuilder();
+		if (geom instanceof ImplicitGeometryHolder) {
+			sb.append("Implicit");
+		}
 		sb.append("Geometry [");
 		sb.append(geom.getType());
 		sb.append(", ");