request #7298: fix some tracker graphs not showing on project homepage

Change-Id: I9a7ec14d9ad5d3e924da97ea6d1b89d58a56b5b1
Merge commit 'refs/changes/33/2833/2' of ssh://gerrit.tuleap.net:29418/tuleap into HEAD

* ssh://gerrit.tuleap.net:29418/tuleap:
  request #7298: fix some tracker graphs not showing on project homepage

Change-Id: Ib0c2fe821ae390c015e8ac853c41608fd4bc306a
This is Tuleap 7.3.99.21

Change-Id: I48356ce1c5b1e2c7126d8bac2807c2bc6e4cc624