am eaaf0512: Crash in print spooler when back pressed before content update complted.

* commit 'eaaf0512fcbf03b926cdbbbb7f54df474ecf861a':
  Crash in print spooler when back pressed before content update complted.

packages/PrintSpooler/src/com/android/printspooler/model/PageContentRepository.java

@@ -486,7 +486,9 @@ public final class PageContentRepository {
                 protected Void doInBackground(Void... params) {
                     synchronized (mLock) {
                         try {
-                            mRenderer.closeDocument();
+                            if (mRenderer != null) {
+                                mRenderer.closeDocument();
+                            }
                         } catch (RemoteException re) {
                             /* ignore */
                         }

packages/PrintSpooler/src/com/android/printspooler/ui/PrintActivity.java

@@ -487,6 +487,10 @@ public class PrintActivity extends Activity implements RemotePrintDocument.Updat
                 requestCreatePdfFileOrFinish();
             } break;
 
+            case STATE_PRINT_CANCELED: {
+                updateOptionsUi();
+            } break;
+
             default: {
                 updatePrintPreviewController(document.changed);