optionalProperties aren't optional in Python constructors

[v-p-b]

The generated Python code constructors always require all properties (both optional and not) to be present as arguments, otherwise a TypeError is raised. This makes classes are hard to use because you have to always specify properties that are usually not relevant (this is a likely reason why they are optional).

AFAICT generated Java classes offer zero-argument constructors for the same type definitions.

I expect to have constructors that don't require optional arguments to be provided for object instantiation in all languages.