eclipse-aascw / aas-core-codegen / 37161529322

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Fix constructor headers without arguments (#839)

The Python, C# and TypeScript constructors checked for no arguments and
for one argument in two separate ``if``'s, so a constructor without
arguments got two headers. For example, Python rendered both
``def __init__(self) -> None:`` and ``def __init__(\n self\n) -> None:``
when the constructor only called the parent constructor. We now use
``elif len(arg_codes) == 1:``.

In C# and TypeScript the branch is not reachable at the moment, as
the constructors without arguments have no inlined statements, and are
not generated at all. We fix them nevertheless for consistency.

We test it with ``Plain_marker``, which only calls ``Marker.__init__``,
in the ``deep_class_hierarchy`` meta-model, and add its JSON and XML
examples for the live tests.

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