[PyQt] assignment helper not generated when constructor has only default arguments

[Gerard Vermeulen]

Hi Phil,

the assignment helper is not generated when a class has a constructor
with only default arguments (see checkAssignmentHelper() in
sip-snapshot-4.10.3-710b71e6f0c6/transform.c).
Attached patch shows my workaround for a class with a constructor having
two default arguments by replacing this constructor with three
constructors having 0, 1, or 2 arguments.

Best regards -- Gerard

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