Add null check to page indicator to prevent crashes in landscape.

Change-Id: I9676c19bcdd9129a8519e96febc779f019bc8a13
diff --git a/src/com/android/launcher3/Launcher.java b/src/com/android/launcher3/Launcher.java
index a5ebb52..88e1532 100644
--- a/src/com/android/launcher3/Launcher.java
+++ b/src/com/android/launcher3/Launcher.java
@@ -505,7 +505,9 @@
         if (mExtractedColors != null && Utilities.isNycOrAbove()) {
             mExtractedColors.load(this);
             mHotseat.updateColor(mExtractedColors, !mPaused);
-            mPageIndicator.updateColor(mExtractedColors);
+            if (mPageIndicator != null) {
+                mPageIndicator.updateColor(mExtractedColors);
+            }
         }
     }