Really fix Dartdoc.

sdk/lib/_internal/dartdoc/lib/dartdoc.dart

 // Copyright (c) 2013, 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.
 
 /**
  * To generate docs for a library, run this script with the path to an
  * entrypoint .dart file, like:
  *
  *     $ dart dartdoc.dart foo.dart
  *
@@ skipping 410 matching lines @@
       }
       content += '<div>${footerItems[i]}</div>';
     }
     return content;
   }
 
   Future documentLibraries(List<Uri> libraryList, Path libPath,
       String packageRoot) {
     _packageRoot = packageRoot;
     _exports = new ExportMap.parse(libraryList, packageRoot);
-    var librariesToAnalyze = _exports.allExportedFiles.map(pathToFileUri);
+    var librariesToAnalyze = _exports.allExportedFiles.toList();
     librariesToAnalyze.addAll(libraryList.map((uri) {
       if (uri.scheme == 'file') return fileUriToPath(uri);
       // dart2js takes "dart:*" URIs as Path objects for some reason.
       return uri.toString();
-    });
+    }));
 
     // TODO(amouravski): make all of these print statements into logging
     // statements.
     print('Analyzing libraries...');
     return dart2js.analyze(
         librariesToAnalyze.map((path) => new Path(path)).toList(), libPath,
         packageRoot: new Path(packageRoot), options: COMPILER_OPTIONS)
       .then((MirrorSystem mirrors) {
         print('Generating documentation...');
         _document(mirrors);
@@ skipping 1694 matching lines @@
 
 
   /**
    * Returns a list of elements in [library], including elements it exports from
    * hidden libraries. [fn] should return the element list for a single library,
    * which will then be merged across all exported libraries.
    */
   List<DeclarationMirror> _libraryContents(LibraryMirror library,
       List<DeclarationMirror> fn(LibraryMirror)) {
     var contents = fn(library).toList();
-    contents.addAll(_exports.exports[_libraryPath(library)].expand((export) {
+    var path = _libraryPath(library);
+    if (path == null) return contents;
+
+    contents.addAll(_exports.exports[path].expand((export) {
       var exportedLibrary = _librariesByPath[export.path];
       // TODO(nweiz): remove this check when issue 9645 is fixed.
       if (exportedLibrary == null) return [];
       if (shouldIncludeLibrary(exportedLibrary)) return [];
       return fn(exportedLibrary).where((declaration) =>
           export.isMemberVisible(declaration.displayName));
     }));
     return contents;
   }
 
@@ skipping 121 matching lines @@
    return '''
         <div class="mdn">
         $mdnComment
         <div class="mdn-note"><a href="$mdnUrl">from MDN</a></div>
         </div>
         ''';
   }
 
   String toString() => mdnComment;
 }