block_info for hp enabled DoFHandler

[ghost]

An error occurred in line <2076> of file </home/fabian/dealii-full/tmp/unpack/deal.II-v9.3.1/include/deal.II/dofs/dof_handler.h> in function
    const dealii::BlockInfo& dealii::DoFHandler<dim, spacedim>::block_info() const [with int dim = 1; int spacedim = 1]
The violated condition was:
    this->hp_capability_enabled == false
Additional information:
    The current function has not yet been implemented for a DoFHandler
    with hp-capabilities.

I recently noticed, that this is missing. Maybe a future project?!

[drwells]

Yes, this would be good to have!