fixed error in exception...

ghost-openstack/scripts/ghost/ghost.py

@@ -35,9 +35,9 @@ def configure(subject=None):
 
     ctx.logger.info('Configuring ghost.')
     
-    _run('sudo apt-get install unzip','Failed installing unzip')
-    _run('curl -L https://ghost.org/zip/ghost-latest.zip -o ~/ghost.zip','Failed downloading ghost')
-    _run('unzip -uo ~/ghost.zip -d ~/ghost','Failed unzipping ghost')  
+    _run('sudo apt-get install unzip',error_message='Failed installing unzip')
+    _run('curl -L https://ghost.org/zip/ghost-latest.zip -o ~/ghost.zip',error_message='Failed downloading ghost')
+    _run('unzip -uo ~/ghost.zip -d ~/ghost',error_message='Failed unzipping ghost')  
     
     template = Template(ctx.get_resource(TEMPLATE_RESOURCE_NAME))
 
@@ -62,12 +62,12 @@ def configure(subject=None):
 
 
 def start():
-    _run('npm install','Failed running npm install')
-    _run('npm start','Failed running npm start')
+    _run('npm install',error_message='Failed running npm install')
+    _run('npm start',error_message='Failed running npm start')
 
 
 def stop():
-    _run('sudo killall nodejs','Failed killing nodejs')
+    _run('sudo killall nodejs',error_message='Failed killing nodejs')
 
 def _run(command, error_message):
     runner = utils.LocalCommandRunner(logger=ctx.logger)