Don’t exit prematurely if compilation failed.

dart/pkg/compiler/lib/src/js_emitter/old_emitter/emitter.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.
 
 part of dart2js.js_emitter;
 
 
 class OldEmitter implements Emitter {
   final Compiler compiler;
   final CodeEmitterTask task;
@@ skipping 737 matching lines @@
         invariant(classElement, builder.fieldMetadata == null);
         properties.properties.addAll(builder.properties);
       } else {
         classEmitter.generateClass(
             classElement, properties, additionalProperties[classElement]);
       }
     });
   }
 
   void emitStaticFunctions(Iterable<Method> staticFunctions) {
+    if (staticFunctions == null) return;
     // We need to filter out null-elements for the interceptors.
     Iterable<Element> elements = staticFunctions
         .where((Method method) => method.element != null)
         .map((Method method) => method.element);
 
     for (Element element in elements) {
       ClassBuilder builder = new ClassBuilder(element, namer);
       containerBuilder.addMember(element, builder);
       getElementDescriptor(element).properties.addAll(builder.properties);
     }
@@ skipping 1336 matching lines @@
     for (Element element in compiler.enqueuer.codegen.newlyEnqueuedElements) {
       if (element.isInstanceMember) {
         cachedClassBuilders.remove(element.enclosingClass);
 
         nativeEmitter.cachedBuilders.remove(element.enclosingClass);
 
       }
     }
   }
 }