Add null check for effectsController

Fixes 12ead10c1bce3072ccda7e10cd5645fff2c10300

Issue: FP3-A13#237
Change-Id: I45cf2db6968160d70595755060e0c728bad8c455
(cherry picked from commit 87e1441dc8743a3518d92f941e6f784c9eedc5c1)
diff --git a/src/com/android/wallpaper/picker/CategorySelectorFragment.java b/src/com/android/wallpaper/picker/CategorySelectorFragment.java
index fe36592..d807f50 100644
--- a/src/com/android/wallpaper/picker/CategorySelectorFragment.java
+++ b/src/com/android/wallpaper/picker/CategorySelectorFragment.java
@@ -302,7 +302,7 @@
             if (mCategory.supportsCustomPhotos()) {
                 EffectsController effectsController =
                         InjectorProvider.getInjector().getEffectsController(getContext());
-                if (!effectsController.isEffectTriggered()) {
+                if (effectsController != null && !effectsController.isEffectTriggered()) {
                     effectsController.triggerEffect(getContext());
                 }
                 getCategorySelectorFragmentHost().requestCustomPhotoPicker(