Bug 412567 - [Model Editor] unable to unset classuri to NULL

Remove the unexpected warning.

Change-Id: Iada84a072a300e108159e012832845aa38a11210
Signed-off-by: Olivier Prouvost <olivier.prouvost@opcoach.com>
diff --git a/bundles/org.eclipse.e4.tools.emf.ui/src/org/eclipse/e4/tools/emf/ui/internal/common/component/DirectMenuItemEditor.java b/bundles/org.eclipse.e4.tools.emf.ui/src/org/eclipse/e4/tools/emf/ui/internal/common/component/DirectMenuItemEditor.java
index 2624b90..16938b4 100644
--- a/bundles/org.eclipse.e4.tools.emf.ui/src/org/eclipse/e4/tools/emf/ui/internal/common/component/DirectMenuItemEditor.java
+++ b/bundles/org.eclipse.e4.tools.emf.ui/src/org/eclipse/e4/tools/emf/ui/internal/common/component/DirectMenuItemEditor.java
@@ -27,8 +27,6 @@
 import org.eclipse.emf.databinding.EMFDataBindingContext;
 import org.eclipse.emf.databinding.EMFProperties;
 import org.eclipse.emf.databinding.IEMFValueProperty;
-import org.eclipse.jface.databinding.swt.IWidgetValueProperty;
-import org.eclipse.jface.databinding.swt.WidgetProperties;
 import org.eclipse.jface.viewers.TreeViewer;
 import org.eclipse.swt.SWT;
 import org.eclipse.swt.custom.CTabFolder;
@@ -92,7 +90,6 @@
 
 	@Override
 	protected void createFormSubTypeForm(Composite parent, EMFDataBindingContext context, WritableValue master) {
-		final IWidgetValueProperty textProp = WidgetProperties.text(SWT.Modify);
 
 		ControlFactory.createClassURIField(parent, Messages, this, Messages.DirectMenuItemEditor_ClassURI,
 				ApplicationPackageImpl.Literals.CONTRIBUTION__CONTRIBUTION_URI,