The fallback number of columns in the grid should be 1 instead of 0.

The span count passed to GridLayoutManager should at least 1.

Bug: 159958634
Change-Id: I00c02fc0677e2b3c138f433f82e7369c8008d3f2
diff --git a/src/com/android/wallpaper/picker/CategorySelectorFragment.java b/src/com/android/wallpaper/picker/CategorySelectorFragment.java
index 8d8d82a..98e739b 100644
--- a/src/com/android/wallpaper/picker/CategorySelectorFragment.java
+++ b/src/com/android/wallpaper/picker/CategorySelectorFragment.java
@@ -194,7 +194,7 @@
 
     private int getNumColumns() {
         Activity activity = getActivity();
-        return activity == null ? 0 : SizeCalculator.getNumCategoryColumns(activity);
+        return activity == null ? 1 : SizeCalculator.getNumCategoryColumns(activity);
     }
 
 
diff --git a/src/com/android/wallpaper/picker/individual/IndividualPickerFragment.java b/src/com/android/wallpaper/picker/individual/IndividualPickerFragment.java
index 80136a1..f4809ce 100755
--- a/src/com/android/wallpaper/picker/individual/IndividualPickerFragment.java
+++ b/src/com/android/wallpaper/picker/individual/IndividualPickerFragment.java
@@ -800,7 +800,7 @@
 
     int getNumColumns() {
         Activity activity = getActivity();
-        return activity == null ? 0 : SizeCalculator.getNumIndividualColumns(activity);
+        return activity == null ? 1 : SizeCalculator.getNumIndividualColumns(activity);
     }
 
     /**