[experiments] Fix monitor command

The handling of the get call was not updated after the webapi module
refactor. This patch fixes this and also properly handles the case
the first call does not work and thus happens before the full ncurse
setup occures.

Fixes #66
4 jobs for 66_fix_monitor_command in 8 minutes and 15 seconds (queued for 2 seconds)
Status Name Job ID Coverage
  Build
passed build_linux_36 #192408
docker-build

00:02:50

54.0%
passed build_linux_37 #192409
docker-build

00:02:49

54.0%
passed build_macosx_36 #192406
macosx

00:08:15

54.0%
passed build_macosx_37 #192407
macosx

00:08:03

54.0%