Fix NPE introduced by ag/16740473.

A PackageState doesn't always have an AndroidPackage, so we need to do a
null check.

Fixes: 222474286
Test: presubmit
Change-Id: I1603f3cb096a72f65360db2ab7d8ff5823c28e0d

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

@@ -2554,6 +2554,9 @@ public class PermissionManagerServiceImpl implements PermissionManagerServiceInt
             for (int i = 0; i < packagesSize; i++) {
                 AndroidPackageApi sharedUserPackage =
                         packages.valueAt(i).getAndroidPackage();
+                if (sharedUserPackage == null) {
+                    continue;
+                }
                 uidRequestedPermissions.addAll(
                         sharedUserPackage.getRequestedPermissions());
                 uidImplicitPermissions.addAll(