Fix NPE in queryPermissionsByGroup

It's possible that the given groupName is null. We should handle this
normal case.

Fix: 232566949
Test: manually verify with 'pm list permissions'.
Change-Id: I267fa62d2d46818c5a41363ebdafb66d59309c25

services/core/java/com/android/server/pm/permission/PermissionManagerServiceImpl.java

@@ -593,8 +593,8 @@ public class PermissionManagerServiceImpl implements PermissionManagerServiceInt
         }
 
         final int callingUserId = UserHandle.getUserId(callingUid);
-        if (mPackageManagerInt.filterAppAccess(permissionGroup.getPackageName(), callingUid,
-                callingUserId)) {
+        if (permissionGroup != null && mPackageManagerInt.filterAppAccess(
+                permissionGroup.getPackageName(), callingUid, callingUserId)) {
             return null;
         }
         out.removeIf(it -> mPackageManagerInt.filterAppAccess(it.packageName, callingUid,