fix(gen): heroku and openshift generators requiring .yo-rc file to work

closes angular-fullstack#318

Author: DaftMonk

heroku/index.js

@@ -15,7 +15,7 @@ var Generator = module.exports = function Generator() {
     this.appname = path.basename(process.cwd());
   }
   this.appname = this._.slugify(this.appname);
-  this.filters = this.config.get('filters');
+  this.filters = this.config.get('filters') || {};
 };
 
 util.inherits(Generator, yeoman.generators.NamedBase);

openshift/index.js

@@ -15,7 +15,7 @@ var Generator = module.exports = function Generator() {
     this.appname = path.basename(process.cwd());
   }
   this.appname = this._.slugify(this.appname).split('-').join('');
-  this.filters = this.config.get('filters');
+  this.filters = this.config.get('filters') || {};
 };
 
 util.inherits(Generator, yeoman.generators.NamedBase);