NPE fix in ExitDetector visitor- in analyzer pkg

pkg/analyzer/test/generated/all_the_rest_test.dart

Index: pkg/analyzer/test/generated/all_the_rest_test.dart
diff --git a/pkg/analyzer/test/generated/all_the_rest_test.dart b/pkg/analyzer/test/generated/all_the_rest_test.dart
index 3c1f95b3b68fc17aa634c543f311ba68ad079a87..7199b94b0bf4f940bf098e5e5e7c4f441358521b 100644
--- a/pkg/analyzer/test/generated/all_the_rest_test.dart
+++ b/pkg/analyzer/test/generated/all_the_rest_test.dart
@@ -6892,6 +6892,14 @@ class ExitDetectorTest extends ParserTestCase {
     _assertTrue("v = throw '';");
   }
 
+  void test_await_false() {
+    _assertFalse("await x;");
+  }
+
+  void test_await_throw_true() {
+    _assertTrue("bool b = await (throw '' || true);");
+  }
+
   void test_binaryExpression_and() {
     _assertFalse("a && b;");
   }