Added Exception to work with offline hosts in cluster

PVEApi.py

@@ -73,7 +73,10 @@ class PVEApi(object):
         vmlist = list()
         for node in nodelist:
             url = self.url + '/nodes/' + node.name + '/qemu'
-            response = json.load(urllib2.urlopen(self.get_request(url), context=ssl._create_unverified_context()))
+            try:
+            	response = json.load(urllib2.urlopen(self.get_request(url), context=ssl._create_unverified_context()))
+            except Exception as e:
+              	passs
             resources = response['data']
             for machine in resources:
                 name = machine[u'name']