fix generator for swagger_model when no property required #146
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Before the fix, the generator is assigning null to
required
field,which raises error
This fix will instead not to create a
required
field for the json, as to match the way how swagger_ui has done it, see https://github.com/swagger-api/swagger-ui/blob/master/test/specs/v1.2/petstore/store.json#L113