Fix issue with registration on tasks

Author: ThomasKranitsas

src/services/ResourceService.js

@@ -231,7 +231,7 @@ async function init (currentUser, challengeId, resource, isCreated) {
     throw new errors.BadRequestError('Cannot delete resources of a completed challenge!')
   }
 
-  if (_.get(challenge, 'status') !== constants.ChallengeStatuses.Active && isCreated && resource.roleId === config.SUBMITTER_RESOURCE_ROLE_ID) {
+  if (!_.get(challenge, 'task.isTask', false) && _.get(challenge, 'status') !== constants.ChallengeStatuses.Active && isCreated && resource.roleId === config.SUBMITTER_RESOURCE_ROLE_ID) {
     throw new errors.BadRequestError(`Cannot create submitter resource on challenge with status ${_.get(challenge, 'status')}`)
   }