[tasks] set pending_addition to False when nodes were serialized
[tasks] set pending_addition to False when nodes were serialized

eayunstack/fuel-web,koder-ua/nailgun-fcert,nebril/fuel-web,prmtl/fuel-web,huntxu/fuel-web,nebril/fuel-web,koder-ua/nailgun-fcert,zhaochao/fuel-web,zhaochao/fuel-web,SmartInfrastructures/fuel-web-dev,SmartInfrastructures/fuel-web-dev,koder-ua/nailgun-fcert,prmtl/fuel-web,nebril/fuel-web,zhaochao/fuel-web,SmartInfrastructures/fuel-web-dev,SmartInfrastructures/fuel-web-dev,prmtl/fuel-web,nebril/fuel-web,eayunstack/fuel-web,huntxu/fuel-web,SmartInfrastructures/fuel-web-dev,koder-ua/nailgun-fcert,prmtl/fuel-web,nebril/fuel-web,eayunstack/fuel-web,stackforge/fuel-web,zhaochao/fuel-web,zhaochao/fuel-web,huntxu/fuel-web,eayunstack/fuel-web,eayunstack/fuel-web,huntxu/fuel-web,huntxu/fuel-web,stackforge/fuel-web,prmtl/fuel-web,stackforge/fuel-web