Missing check led to an attempt to construct a disposed GUI.

refs 3230

org.fortiss.af3.specification.ui/trunk/src/org/fortiss/af3/specification/ui/editor/.ratings

@@ -7,4 +7,4 @@ RequirementVVDashboard.java b99428a26586b3af021abe7bc953dd9b09fc8d47 GREEN
 RequirementVVDashboardBinding.java 275b00aba4e93440418ccaeea3041e0390dd0c01 GREEN
 StateAutomatonVVDashboard.java ba094188ba8677e03884cbf81e6904da33835b47 GREEN
 StateAutomatonVVDashboardEditorBinding.java a1996b84336eb5dcf04ec52161a8955a5c03196c GREEN
-VVDashboardBase.java b599ac00a8d78931fbd34a3479503f956e24ac44 GREEN
+VVDashboardBase.java bef17afe2cea9ff7d11ebe1cc5bddb6642bf920c YELLOW

org.fortiss.af3.specification.ui/trunk/src/org/fortiss/af3/specification/ui/editor/VVDashboardBase.java

@@ -184,7 +184,7 @@ public abstract class VVDashboardBase<T extends EObject> extends FormsEditorBase
 	 * according to the status of <code>c</code>.
 	 */
 	private void prepareStatus(Label status, Button b, Composite globalComp, ConstraintInstance c) {
-		if(c != null) {
+		if(c != null && globalComp.getDisplay() != null) {
 			globalComp.setVisible(true);
 			status.setText(ConstraintsUIUtils.getText(c));
 			status.setForeground(ConstraintsUIUtils.getColor(c));