inspection tool window: NPE when ref-entity is null fixed + QF button can be disabled

platform/lang-impl/src/com/intellij/codeInspection/ui/InspectionResultsView.java

@@ -486,7 +486,9 @@ public class InspectionResultsView extends JPanel implements Disposable, Occuren
   }
 
   private JComponent createBaseRightComponentFor(int problemCount, RefEntity selectedEntity) {
-    if (selectedEntity instanceof RefElement && !(((RefElement)selectedEntity).getElement() instanceof PsiDirectory)) {
+    if (selectedEntity instanceof RefElement &&
+        selectedEntity.isValid() &&
+        !(((RefElement)selectedEntity).getElement() instanceof PsiDirectory)) {
       PsiElement selectedElement = ((RefElement)selectedEntity).getElement();
       if (problemCount == 1) {
         CommonProblemDescriptor[] descriptors = myTree.getSelectedDescriptors();

platform/lang-impl/src/com/intellij/codeInspection/ui/QuickFixToolbar.java

@@ -258,6 +258,7 @@ public class QuickFixToolbar extends JPanel implements InspectionTreeLoadingProg
       if (icon == null) {
         icon = AllIcons.Actions.CreateFromUsage;
       }
+      button.setEnabled(presentation.isEnabled());
       button.setIcon(IconLoader.getTransparentIcon(icon, 0.75f));
       new ClickListener() {
         @Override