Return null when setting can't be changed.

If a Slice cannot be changed, return null instead of
an error slice.

Bug: 80155832
Test: robotests
Change-Id: I843fee76cf19d49cc994062059cb231f222120b2
Merged-In: Ib94136c449c6d9c1911f89833bba62fd2263daa4

tests/robotests/src/com/android/settings/testutils/SliceTester.java

@@ -191,20 +191,8 @@ public class SliceTester {
         assertThat(toggles).isEmpty();
 
         final PendingIntent primaryPendingIntent = metadata.getPrimaryAction().getAction();
-        final int availabilityStatus = SliceBuilderUtils.getPreferenceController(context,
-                sliceData).getAvailabilityStatus();
-        switch (availabilityStatus) {
-            case UNSUPPORTED_ON_DEVICE:
-            case CONDITIONALLY_UNAVAILABLE:
-                assertThat(primaryPendingIntent).isEqualTo(
-                        SliceBuilderUtils.getSettingsIntent(context));
-                break;
-            case DISABLED_FOR_USER:
-            case DISABLED_DEPENDENT_SETTING:
-                assertThat(primaryPendingIntent).isEqualTo(
-                        SliceBuilderUtils.getContentPendingIntent(context, sliceData));
-                break;
-        }
+        assertThat(primaryPendingIntent).isEqualTo(SliceBuilderUtils.getContentPendingIntent(
+                context, sliceData));
 
         final List<SliceItem> sliceItems = slice.getItems();
         assertTitle(sliceItems, sliceData.getTitle());