Add back print that got lost in last minute edit.

pkg/fletchc/lib/src/driver/developer.dart

 // Copyright (c) 2015, the Fletch 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.md file.
 
 library fletchc.driver.developer;
 
 import 'dart:async' show
     Future,
     Timer;
 
@@ skipping 373 matching lines @@
   }
 
   Future printException() async {
     String exception = await session.exceptionAsString();
     print(exception);
   }
 
   Future printTrace() async {
     String list = await session.list();
     String stackTrace = session.debugState.formatStackTrace();
-    if (!stackTrace.isEmpty) (stackTrace);
+    if (!stackTrace.isEmpty) print(stackTrace);
     if (!stackTrace.isEmpty) print(list);
   }
 
   try {
     switch (command.code) {
       case CommandCode.UncaughtException:
         state.log("Uncaught error");
         exitCode = exit_codes.DART_VM_EXITCODE_UNCAUGHT_EXCEPTION;
         await printException();
         await printTrace();
@@ skipping 486 matching lines @@
       "packages": packages == null ? null : "$packages",
       "options": options,
       "constants": constants,
       "device_address": deviceAddress,
       "device_type": (deviceType == null)
           ? null
           : unParseDeviceType(deviceType),
     };
   }
 }