Fixes #39 changed WorkflowToolData to allow optional datasets #40
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Added a new parameter to WorkflowToolData to allow setting inputs as optional. I also updated the executors to handle the case where there is no data set for an optional input.
This is a breaking change since older datawolf instances will not have the new parameter. It's a fairly simple fix to update the WorkfowToolData table with:
ALTER TABLE WorkflowToolData ADD COLUMN "allownull" BOOLEAN DEFAULT FALSE;