allow 'display_family' to work even in the absence of IPython

Closes #11 (closed).

changed the description

added 4 commits

• e83157b9...82c780a2 - 2 commits from branch stable-1.2
• e439fb80 - add test that display_family should raise when IPython is not available
• 81c8104f - make 'display_family' work even in the absence of IPython

Compare with previous version

enabled an automatic merge when the pipeline for 81c8104f succeeds

merged

mentioned in commit 44e7082e

mentioned in issue #11 (closed)