Fix handling empty patternProperties when it's not required"

[ahassany]

Simple fix this case { "$schema": "http://json-schema.org/draft-03/hyper-schema#", "id": "http://example.com/schema#", "name": "ExampleSchema", "type": "object", "additionalProperties": true, "properties": { "id": { "minLength": 1, "required": true, "type": "string" }, "patprops": { "required": false, "type": "object", "patternProperties": { ".*$": { "required": true, "type": "array", "uniqueItems": true, "items": [ { "type": "string" } ] } } } } }

validictory.validate({"id": "1"}, schema)

Traceback (most recent call last): File "", line 1, in File "/usr/local/lib/python2.6/dist-packages/validictory-0.8.1-py2.6.egg/validictory/init.py", line 28, in validate return v.validate(data, schema) File "/usr/local/lib/python2.6/dist-packages/validictory-0.8.1-py2.6.egg/validictory/validator.py", line 496, in validate self._validate(data, schema) File "/usr/local/lib/python2.6/dist-packages/validictory-0.8.1-py2.6.egg/validictory/validator.py", line 499, in _validate self.validate("_data", {"_data": data}, schema) File "/usr/local/lib/python2.6/dist-packages/validictory-0.8.1-py2.6.egg/validictory/validator.py", line 528, in validate newschema.get(schemaprop)) File "/usr/local/lib/python2.6/dist-packages/validictory-0.8.1-py2.6.egg/validictory/validator.py", line 178, in validate_properties properties.get(eachProp)) File "/usr/local/lib/python2.6/dist-packages/validictory-0.8.1-py2.6.egg/validictory/validator.py", line 528, in __validate newschema.get(schemaprop)) File "/usr/local/lib/python2.6/dist-packages/validictory-0.8.1-py2.6.egg/validictory/validator.py", line 241, in validate_patternProperties for key, value in value_obj.items(): AttributeError: 'NoneType' object has no attribute 'items'