fixed NPE

refs 311

org.fortiss.tooling.kernel.ui/trunk/src/org/fortiss/tooling/kernel/ui/internal/ContextMenuService.java

@@ -43,7 +43,7 @@ import org.osgi.framework.Bundle;
  * @author hoelzl
  * @author $Author$
  * @version $Rev$
- * @ConQAT.Rating GREEN Hash: 794D71DA1264AB09BBB8AE9A13C77E47
+ * @ConQAT.Rating YELLOW Hash: D5BB94A9DB8CACB9E4142CEE1206C1B1
  */
 public class ContextMenuService implements IContextMenuService {
 
@@ -136,8 +136,12 @@ public class ContextMenuService implements IContextMenuService {
 			if (menuSectionID == null) {
 				menuSectionID = IWorkbenchActionConstants.MB_ADDITIONS;
 			}
-			for (IContributionItem item : contributor.getContributedItems(
-					selection, contextProvider)) {
+			List<IContributionItem> l = contributor.getContributedItems(
+					selection, contextProvider);
+			if (l == null) {
+				continue;
+			}
+			for (IContributionItem item : l) {
 				menu.appendToGroup(menuSectionID, item);
 			}
 		}