resize_function is NULL for ParameterEvent new_parameters, changed_parameters, deleted_parameters

[malsbat]

This causes the rmw_dps implementation to crash. This worked in Crystal.

In the master branch, build/rcl_interfaces/rosidl_typesupport_introspection_cpp/rcl_interfaces/msg/parameter_event__type_support.cpp, resize_function__ParameterEvent__new_parameters is defined, but it is not included in the ParameterEvent_message_member_array structure.

In release-crystal-20190408 the resize_function is included.

I see that the check to define the function uses isinstance(member.type, AbstractSequence) whereas the check to include it is isinstance(member.type.value_type, AbstractSequence). I'm not sure which one is correct.

[jacobperron]

Looking at the following diff, I would say the check to include it should be isinstance(member.type, AbstractSequence):

416ebd8/rosidl_typesupport_introspection_cpp/resource/msg__type_support.cpp.em#diff-aba1f884b18aaf4e81588ad9968b55bfR175

See if #379 works.

[alsora]

I tested the PR and it looks that it fixes the problem!

[malsbat]

The PR looks good to me, thanks.