[FMI] Force user to define initial values for top-level outputs
When exporting to FMU, request that all initial values for output ports are defined
(from redmine: issue id 2807, created on 2017-01-26, closed on 2019-06-03)
When exporting to FMU, request that all initial values for output ports are defined
(from redmine: issue id 2807, created on 2017-01-26, closed on 2019-06-03)