dartdoc: --omit-generation-time flag to exclude generation time from output

lib/dartdoc/dartdoc.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.
 
 /**
  * To generate docs for a library, run this script with the path to an
  * entrypoint .dart file, like:
  *
  *     $ dart dartdoc.dart foo.dart
  *
@@ skipping 100 matching lines @@
 
   parseOptions(frogPath, ['', '', '--libdir=$libDir'], files);
   initializeWorld(files);
 
   final dartdoc = new Dartdoc();
 
   if (includeSource != null) dartdoc.includeSource = includeSource;
   if (mode != null) dartdoc.mode = mode;
   if (outputDir != null) dartdoc.outputDir = outputDir;
   if (generateAppCache != null) dartdoc.generateAppCache = generateAppCache;
-  if (omitGenerationTime != null) dartdoc.omitGenerationTime = omitGenerationTime;
+  if (omitGenerationTime != null) {
+    dartdoc.omitGenerationTime = omitGenerationTime;
+  }
 
   cleanOutputDirectory(dartdoc.outputDir);
 
   // Compile the client-side code to JS.
   final clientScript = (dartdoc.mode == MODE_STATIC) ? 'static' : 'live-nav';
   final Future scriptCompiled = compileScript(compilerPath,
                 '$scriptDir/client-$clientScript.dart',
                 '${dartdoc.outputDir}/client-$clientScript.js');
 
   final Future filesCopied = copyFiles('$scriptDir/static', dartdoc.outputDir);
@@ skipping 1238 matching lines @@
       if (filename.endsWith('appcache.manifest')) {
         return;
       }
       var relativePath = filename.substring(pathPrefixLength + 1);
       write("$relativePath\n");
     };
     toCache.onDone = (done) => endFile();
     toCache.list(recursive: true);
   }
 }