Do not take into account periods with 0 values in time histogram
Do not take into account periods with 0 values in time histogram

Signed-off-by: Ido Barnea <3a6e28cf60eb2f9d9d6e5ab6275926d9a599fe66@cisco.com>

dimagol/trex-core,kisel/trex-core,kisel/trex-core,kisel/trex-core,kisel/trex-core,kisel/trex-core,dimagol/trex-core,dimagol/trex-core,kisel/trex-core,dimagol/trex-core,dimagol/trex-core,dimagol/trex-core