[Bugfix]fix NullPointException when pkg is null

When running stability tests on Android13,AndroidPackage will be null sometime, it will casue system server NPE.

Bug:259835905
Test: MTBF

Change-Id: I8a8e7f7a6c2dd48e0d6a704d033e965912fb2fd2

services/core/java/com/android/server/pm/ComputerEngine.java

@@ -5718,7 +5718,8 @@ public class ComputerEngine implements Computer {
             return PackageInfoUtils.generateProcessInfo(sus.processes, 0);
         } else if (settingBase instanceof PackageSetting) {
             final PackageSetting ps = (PackageSetting) settingBase;
-            return PackageInfoUtils.generateProcessInfo(ps.getPkg().getProcesses(), 0);
+            final AndroidPackage pkg = ps.getPkg();
+            return pkg == null ? null : PackageInfoUtils.generateProcessInfo(pkg.getProcesses(), 0);
         }
         return null;
     }