Unicode empty string literals
Unicode empty string literals

Consistent with JSON parsing, to avoid warnings or errors when data
finds its way into unicode-careful code (like SQLAlchemy)

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