Protect against crash on user switch

Somehow one of the tiles doesn't have a view yet. Assume that this
is a transient part of the tiles getting recreated and that the skipped
tile will get picked up in the next layout.

Change-Id: Ia1370d66119bfcfa7b00bd087bcb0d72a072666a
Fixes: 31394359

packages/SystemUI/src/com/android/systemui/qs/QSAnimator.java

@@ -160,6 +160,10 @@ public class QSAnimator implements Callback, PageListener, Listener, OnLayoutCha
 
         for (QSTile<?> tile : tiles) {
             QSTileBaseView tileView = mQsPanel.getTileView(tile);
+            if (tileView == null) {
+                Log.e(TAG, "tileView is null " + tile.getTileSpec());
+                continue;
+            }
             final TextView label = ((QSTileView) tileView).getLabel();
             final View tileIcon = tileView.getIcon().getIconView();
             if (count < mNumQuickTiles && mAllowFancy) {