Show policy transparent of "Force stop" when no DO

PackageManager.isPackageStateProtected() is moving to permission based,
so force stop button can also be protected when no DeviceOwner.

The ActivityManger side has already handled correctly, no Settings UI
side need to show a device policy transparent dialog.

Fix: 319579347
Test: manual - Force stop on AppInfo
Test: unit test
Change-Id: I4432dcb798a0cfcbb6bfc8b30c9191dd91b980a2

src/com/android/settings/spa/app/appinfo/AppForceStopButton.kt

@@ -19,6 +19,7 @@ package com.android.settings.spa.app.appinfo
 import android.app.settings.SettingsEnums
 import android.content.pm.ApplicationInfo
 import android.os.UserManager
+import androidx.annotation.VisibleForTesting
 import androidx.compose.material.icons.Icons
 import androidx.compose.material.icons.outlined.Report
 import androidx.compose.material3.Text
@@ -87,9 +88,10 @@ class AppForceStopButton(
         dialogPresenter.open()
     }
 
-    private fun getAdminRestriction(app: ApplicationInfo): EnforcedAdmin? = when {
+    @VisibleForTesting
+    fun getAdminRestriction(app: ApplicationInfo): EnforcedAdmin? = when {
         packageManager.isPackageStateProtected(app.packageName, app.userId) -> {
-            RestrictedLockUtilsInternal.getDeviceOwner(context)
+            RestrictedLockUtilsInternal.getDeviceOwner(context) ?: EnforcedAdmin()
         }
 
         else -> RestrictedLockUtilsInternal.checkIfRestrictionEnforced(