Bug#1033878: python3-brial: Missing runtime dependency

[Bastian Germann]

Package: python3-brial
Severity: serious

python3 -c 'import brial' leads to
Traceback (most recent call last):
   File "<stdin>", line 1, in <module>
   File "/usr/lib/python3/dist-packages/brial/__init__.py", line 31, in <module>
     from .PyPolyBoRi import *
   File "/usr/lib/python3/dist-packages/brial/PyPolyBoRi.py", line 66, in <module>
     from sage import all
ModuleNotFoundError: No module named 'sage'

So python3-sage must be in Depends.