story #5984 - see open/closed cards percentage fallback

Display either an effort based progress bar or a card count based bar depending
on the availability of initial effort info

Change-Id: I010ce00956a12b0198feb1071366524575a54cf2
Merge commit 'refs/changes/68/1868/2' of http://gerrit.tuleap.net/tuleap into HEAD

* http://gerrit.tuleap.net/tuleap:
  story #5984 - see open/closed cards percentage fallback

Change-Id: I8b0bffe347b2e86877d775fbbf792c6c1c416c6e
This is Tuleap 6.10.99.9

Change-Id: I64c27b68fdc1c89c84f756fd8c1d5d94963042cb