[unrelated] Disable preference contribution to closed project
diff --git a/plugins/org.eclipse.ocl.xtext.oclinecore.ui/plugin.xml b/plugins/org.eclipse.ocl.xtext.oclinecore.ui/plugin.xml
index 3abd37f..161b193 100644
--- a/plugins/org.eclipse.ocl.xtext.oclinecore.ui/plugin.xml
+++ b/plugins/org.eclipse.ocl.xtext.oclinecore.ui/plugin.xml
@@ -385,6 +385,7 @@
          <enabledWhen>
             <adapt type="org.eclipse.core.resources.IProject"/>
          </enabledWhen>
+         <filter name="open" value="true"/>
       </page>
    </extension>