Restore detection of missing terminado package#5465

Merged

blink1073 merged 6 commits intojupyter:masterfrom kevin-bates:detect-missing-terminado

May 25, 2020

+28-16

Commits on May 20, 2020

Commits on May 21, 2020

Further clarity on terminal availability
kevin-bates
committed

Commits on May 24, 2020