Refs #48 - Make the not(value) check more specific to avoid throwing errors for e.g. a value of 0.
Refs #48 - Make the not(value) check more specific to avoid throwing errors for e.g. a value of 0.

okfn/datapackage-py,okfn/datapackage-model-py,sirex/datapackage-py,datapackages/datapackage-py,okfn/datapackage-model-py,sirex/datapackage-py,datapackages/datapackage-py,okfn/datapackage-py