WallpaperService crashes becuase of a log statement

Log.wtf should have been Log.e and it is only an informative log

Fixes: 192327606
Test: WallpaperServiceTest
Change-Id: I2e13cf6f7f7abffbb8d3f28aeaa0605711085157

core/java/android/service/wallpaper/WallpaperService.java

@@ -776,8 +776,10 @@ public abstract class WallpaperService extends Service {
                 WallpaperColors color = colors.get(i);
                 RectF area = regions.get(i);
                 if (color == null || area == null) {
-                    Log.wtf(TAG, "notifyLocalColorsChanged null values. color: "
-                            + color + " area " + area);
+                    if (DEBUG) {
+                        Log.e(TAG, "notifyLocalColorsChanged null values. color: "
+                                + color + " area " + area);
+                    }
                     continue;
                 }
                 try {