Merge "Skip reading config file that does not exist" into udc-dev am: 5b61ce8ff9

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/21493286

Change-Id: Ida6f5fa28dd495ef4922cfc42bc59508b088398e
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>

services/core/java/com/android/server/wm/LetterboxConfigurationPersister.java

@@ -216,6 +216,10 @@ class LetterboxConfigurationPersister {
     }
 
     private void readCurrentConfiguration() {
+        if (!mConfigurationFile.exists()) {
+            useDefaultValue();
+            return;
+        }
         FileInputStream fis = null;
         try {
             fis = mConfigurationFile.openRead();