dvp build should warn when there is no required dictionary being returned by an upgrade method

[fdrozdowski]

I had an upgrade definition like this:

‘’'
@plugin.upgrade.repository(‘2020.02.12.1’)
def upgrade_repository(old_repository):
  return
‘’'

dvp build was successful but this causes an error during the upload/upgrade on the engine. The error message was :

Error
Plugin “nix_direct_python” provided an incorrect format while upgrading.Expected APPDATA_REPOSITORY-20, but received NULL
Error Code
exception.plugin.upgrade.returned.non.object

It would be good for the "dvp" tool to flag such issues during the build phase itself.

┆Issue is synchronized with this Jira Bug by Unito