OPAL-2109: Show progress bar when task is submitted to indexManager (allow a stauts of IN_PROGRESS with progress=0 to indicate that task is submitted)
OPAL-2109: Merge changes to ValueTableIndexResource
OPAL-2109: set progress only when not null
OPAL-2109: Return progress 0 when the indexation is the current task AND when it is already queued
Merge pull request #353 from emorency/feature/OPAL-2109-Index-Progressbar

OPAL-2109: Progress is 0 when the indexation is the current task AND when it is already queued