Bug#1017439: gr-satellites: Dependency missing tnc_nx

[Christoph Berg <myon@debian.org>]

Re: tony mancill
> > Unable to import tnc_nx
> > gr-tnc_nx needs to be installed to use Mobitex
> 
> Thank you for the bug report.  For whoever works on this one, there
> appear to be other missing dependencies.  When trying to reproduce this
> on sid after installing gr-satellites, I get this error:
> 
> $ gr_satellites AMGU-1 --audio default --samp 48e3
> Traceback (most recent call last):
>   File "/usr/bin/gr_satellites", line 15, in <module>
>     from gnuradio import gr, blocks, audio
> ModuleNotFoundError: No module named 'gnuradio'

It would also be interesting to know how many sats/submodules need
some missing python module so we know if the package is
totally/somewhat/slightly unusable without it.

Christoph (who still hasn't found the time to get into LEOs)