Update NPMSTest to check for file existence

Add a check for file exists to prevent test crash

Bug: 432481295
Test: atest services/tests/servicestests/src/com/android/server/net/NetworkPolicyManagerServiceTest.java
Flag: TEST_ONLY
Change-Id: I73de33622821b58018669ebe5d8e79b4c29f70d7

parent a36f5b8e

services/tests/servicestests/src/com/android/server/net/NetworkPolicyManagerServiceTest.java

+1 −1

Original line number	Diff line number	Diff line
		@@ -643,7 +643,7 @@ public class NetworkPolicyManagerServiceTest {

		@After
		public void removeFiles() throws Exception {
		if (mPolicyDir != null) {
		if (mPolicyDir != null && mPolicyDir.exists()) {
		for (File file : mPolicyDir.listFiles()) {
		file.delete();
		}