fix crash in VM type checked mode

tools/testing/dart/test_runner.dart

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 /**
  * Classes and methods for executing tests.
  *
  * This module includes:
  * - Managing parallel execution of tests, including timeout checks.
  * - Evaluating the output of each test as pass/fail/crash/timeout.
@@ skipping 530 matching lines @@
 
   /**
    * Called when all commands are executed. [exitCode] is 0 if all command
    * succeded, otherwise it will have the exit code of the first failing
    * command.
    */
   void testComplete(int exitCode) {
     new TestOutput.fromCase(testCase, exitCode, timedOut, stdout,
                             stderr, new Date.now().difference(startTime));
     timeoutTimer.cancel();
-    if (testCase.output.unexpectedOutput && processQueue._verbose) {
+    if (testCase.output.unexpectedOutput
+        && testCase.configuration['verbose'] != null
+        && testCase.configuration['verbose']) {
       print(testCase.displayName);
       for (var line in testCase.output.stderr) print(line);
       for (var line in testCase.output.stdout) print(line);
     }
     if (allowRetries && testCase.usesWebDriver
         && testCase.output.unexpectedOutput
         && testCase.dynamic.numRetries > 0) {
       // Selenium tests can be flaky. Try rerunning.
       testCase.output.requestRetry = true;
     }
@@ skipping 598 matching lines @@
         // the developer doesn't waste his or her time trying to fix a bunch of
         // tests that appear to be broken but were actually just flakes that
         // didn't get retried because there had already been one failure.
         bool allowRetry = _MAX_FAILED_NO_RETRY > _progress.numFailedTests;
         new RunningProcess(test, allowRetry, this).start();
       }
       _numProcesses++;
     }
   }
 }