SOC-3298 [Space Members] Alphabet bar disappears when there is no result

Problem analysis:
* Alphabet bar only appear when there is at least one result

Fix description:
* Render the alphabet bar independent from result number
* Remove the second message when there is no result to avoid message duplication
* Remove the redundant variable invoking UIMembersPortlet.label.admin
Merge commit '3fb41c844d12417a396f4997490b9ef68a319226' into HEAD