Do not log an error when app restriction file does not exist

Bug: 20040207
Change-Id: Ibd257388a185020258e36bddf5b451dc24c0b7ee
diff --git a/services/core/java/com/android/server/pm/UserManagerService.java b/services/core/java/com/android/server/pm/UserManagerService.java
index 5e58cd9..b8c26a4 100644
--- a/services/core/java/com/android/server/pm/UserManagerService.java
+++ b/services/core/java/com/android/server/pm/UserManagerService.java
@@ -1689,6 +1689,9 @@
     static Bundle readApplicationRestrictionsLocked(AtomicFile restrictionsFile) {
         final Bundle restrictions = new Bundle();
         final ArrayList<String> values = new ArrayList<>();
+        if (!restrictionsFile.getBaseFile().exists()) {
+            return null;
+        }
 
         FileInputStream fis = null;
         try {