Fix checked mode error

lib/src/options.dart

 // Copyright (c) 2014, 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.
 
 /// Set of flags and options passed to the compiler
 library dev_compiler.src.options;
 
 import 'dart:io';
 
 import 'package:args/args.dart';
@@ skipping 293 matching lines @@
       ignoreTypes: args['ignore-types'],
       wrapClosures: args['wrap-closures'],
       outputDart: args['dart-gen'],
       outputDir: outputDir,
       covariantGenerics: args['covariant-generics'],
       relaxedCasts: args['relaxed-casts'],
       useColors: useColors,
       useMultiPackage: args['use-multi-package'],
       packageRoot: args['package-root'],
       packagePaths: args['package-paths'].split(','),
-      resources: args['resources'].split(','),
+      resources: args['resources']
+          .split(',')
+          .where((s) => s.isNotEmpty)
+          .toList(),

[vsm, 2015/05/29 19:32:32]

Before, we had [''] - which caused one bogus resource load.

       inferDownwards: args['infer-downwards'],
       inferFromOverrides: args['infer-from-overrides'],
       inferTransitively: args['infer-transitively'],
       onlyInferConstsAndFinalFields: args['infer-only-finals'],
       nonnullableTypes: optionsToList(args['nonnullable'],
           defaultValue: TypeOptions.NONNULLABLE_TYPES),
       help: args['help'],
       useMockSdk: args['mock-sdk'],
       dartSdkPath: sdkPath,
       logLevel: logLevel,
@@ skipping 132 matching lines @@
     // The pub-cache directory is two levels up, but we verify that the layout
     // looks correct.
     if (path.basename(dir) != 'dev_compiler') return null;
     dir = path.dirname(dir);
     if (path.basename(dir) != 'global_packages') return null;
     dir = path.dirname(dir);
     return path.join(dir, cacheDir, 'lib', 'runtime');
   }
   return null;
 }