Fix request #6238. Filtering-out vertical spaces from artifacts text-areas

Change-Id: Ia22e7ff6a3dffc8189db1e05d127c1dd8e9b8ace
Merge commit 'refs/changes/23/1923/14' of ssh://gerrit.tuleap.net:29418/tuleap into stable

* ssh://gerrit.tuleap.net:29418/tuleap:
  Fix request #6238. Filtering-out vertical spaces from artifacts text-areas

Conflicts:
	src/common/autoload.php
This is Tuleap 6.10.99.58

Change-Id: I9f1cf4e02a72bc9aeb0f0072b36a5a6bda46c817