INTEG-144: [integ-ecms-social] Activity Stream crashes due to scheduled publication

Fix description:
  - In case scheduled publication, there is no user, fix the code to use the remaining information to avoid null Exception
INTEG-194 | Some Unit Testcases failed by component configuration wrong.
Merge commit 'f1a0d158f4701b587cb9d726019bfe13123d2114' into HEAD