Fix request #5779: Fatal error when using getSvnStatsFiles SOAP method

Change-Id: Iabf1adc10a4446b6d0ceaa2732aa75fe53daaaa9
Merge commit 'refs/changes/89/1589/1' of http://gerrit.tuleap.net/tuleap into HEAD

* http://gerrit.tuleap.net/tuleap:
  Fix request #5779: Fatal error when using getSvnStatsFiles SOAP method

Change-Id: I11332a6a34ee5a5af62f84661c67bc4e556e47a5
This is Tuleap 6.8.99.7

Change-Id: I014bd5abb6783ee2b1e96622e77ebf1ad95a3f75