Protect against crash while sysui is initing

Sometimes when switching users not all the views are there yet, but
we will get another layout callback once they are, and can update
our animators then.

Change-Id: I029839e5c69c8c441cf89b0536a90e223dc35180
Fixes: 35949496
Test: Switch users

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

@@ -175,7 +175,8 @@ public class QSAnimator implements Callback, PageListener, Listener, OnLayoutCha
             View view = mQs.getView();
             if (count < mNumQuickTiles && mAllowFancy) {
                 // Quick tiles.
-                com.android.systemui.plugins.qs.QSTileView quickTileView = mQuickQsPanel.getTileView(tile);
+                QSTileView quickTileView = mQuickQsPanel.getTileView(tile);
+                if (quickTileView == null) continue;
 
                 lastX = loc1[0];
                 getRelativePosition(loc1, quickTileView.getIcon().getIconView(), view);