Merge pull request #155 from devoncarew/devoncarew_fix_npe

fix an npe when generating samples

lib/src/cli_app.dart

@@ -18,7 +18,7 @@ import 'package:stagehand/src/common.dart';
 const String APP_NAME = 'stagehand';
 
 // This version must be updated in tandem with the pubspec version.
-const String APP_VERSION = '0.1.3+1';
+const String APP_VERSION = '0.1.3+2';
 
 // The Google Analytics tracking ID for stagehand.
 const String _GA_TRACKING_ID = 'UA-55033590-1';

lib/stagehand.dart

@@ -100,9 +100,11 @@ abstract class Generator implements Comparable<Generator> {
       'year': new DateTime.now().year.toString()
     };
 
-    additionalVars.keys.forEach((key) {
-      vars[key] = additionalVars[key];
-    });
+    if (additionalVars != null) {
+      additionalVars.keys.forEach((key) {
+        vars[key] = additionalVars[key];
+      });
+    }
 
     if (!vars.containsKey('author')) {
       vars['author'] = '<your name>';

pubspec.yaml

@@ -4,7 +4,7 @@
 
 name: stagehand
 # When changing this version, change the lib/src/cli_app.dart version as well.
-version: 0.1.3+1
+version: 0.1.3+2
 description: >
   A scaffolding generator for your Dart projects. Stagehand helps you get set
   up!