story #7508: Fetch all "to be planned" cards (without children)

Change-Id: Idc916522638b94a34a8c022289fc639115b54bc1
Merge commit 'refs/changes/38/3138/10' of ssh://gerrit.tuleap.net:29418/tuleap into HEAD

* ssh://gerrit.tuleap.net:29418/tuleap:
  story #7508: Fetch all "to be planned" cards (without children)

Change-Id: Ie89276be3d4a9486edaded5f12daa7f7b7599553
This is Tuleap 7.6.99.7

Change-Id: I109883d2a0d7b938f99fdf709197839d15a11533