add exeception handling for invalid commands over nxapi

This commit will catch invalid commands being send over nxapi and call
fail_json on the module.  The nxos shared module will now return the
failure

lib/ansible/module_utils/nxos.py

@@ -100,8 +100,8 @@ class Nxapi(object):
 
         headers = {'Content-Type': 'application/json'}
 
-        response, headers = fetch_url(self.module, self.url, data=data, headers=headers,
-                                      method='POST')
+        response, headers = fetch_url(self.module, self.url, data=data,
+                headers=headers, method='POST')
 
         if headers['status'] != 200:
             self.module.fail_json(**headers)
@@ -109,6 +109,7 @@ class Nxapi(object):
         response = self.module.from_json(response.read())
         result = list()
 
+        try:
             output = response['ins_api']['outputs']['output']
             if isinstance(output, list):
                 for item in response['ins_api']['outputs']['output']:
@@ -122,7 +123,8 @@ class Nxapi(object):
                         code=item['code'])
             else:
                 result.append(output['body'])
-
+        except Exception:
+            self.module.fail_json(**headers)
 
         return result
 
@@ -200,6 +202,7 @@ class NetworkModule(AnsibleModule):
         cmd = 'show running-config'
         if self.params.get('include_defaults'):
             cmd += ' all'
+
         if self.params['transport'] == 'cli':
             return self.execute(cmd)[0]
         else: