Non-informative error message when payload is a list

[Alexey Khivin]

Tried to declare a method and missed the Body tag.

Got python exception without any information about a position of error (nor class name, nor file, nor the line or column)

http://paste.openstack.org/show/514141/

Would be better to tell user the exact place and the reason of an error

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/329867

[Khayam Gondal (khayamgondal)]

Hi Alexey Khivin, Can you tell me how to reproduce this error.

[Valerii Kovalchuk (vakovalchuk)]

Khayam, I believe you may take any class from any murano app, remove the `Body` word from the `Deploy` method , and try to deploy the app. Like here: https://github.com/openstack/murano-apps/blob/master/ApacheHTTPServer/package/Classes/ApacheHttpServer.yaml#L40

[OpenStack Infra (hudson-openstack)]

Change abandoned by Kirill Zaitsev (<email address hidden>) on branch: master
Review: https://review.openstack.org/329867