SCHEDULER: Fix bug introduced in 33580a3 with DispatchStart
SCHEDULER: Fix bug introduced in 33580a3 with DispatchStart

If store exists and a new plugin is added, DispatchStart might
already exist. In this case overwriting DispatchStar will make
plugins sleep until DispatchCount steps are reached. However,
DispatchStart needs to be initialized for new stores created
in the meantime as otherwise we enter loops that run continuously.

VincentToups/lambdanative,VincentToups/lambdanative,VincentToups/lambdanative,VincentToups/lambdanative,VincentToups/lambdanative