request #7236: fatal error on system events UI- foreign events not rejected by fulltext

E.g. to test: create a new git repo

Change-Id: I7b04c5f566001fb4d637a18567e2de43a5371159
Merge commit 'refs/changes/80/2780/2' of ssh://gerrit.tuleap.net:29418/tuleap into HEAD

* ssh://gerrit.tuleap.net:29418/tuleap:
  request #7236: fatal error on system events UI- foreign events not rejected by fulltext

Change-Id: I660c08699a86a8aeb2dd701711dc6fe56c2d11c0
This is Tuleap 7.2.99.59

Change-Id: I8edd19379ae5f9bac4f2a2b99b7a92b19997741a