resolve RuntimeError from listdevice() with an area detector object

[prjemian]

• close RuntimeError from listdevice() #990

[prjemian]

Root cause: area detector IOC has just started and no image data has been passed from cam to image plugins. Image shape tuple is all zeroes. This is raised by ophyd.areadetector.base. We can trap that so that listdevice() will not fail. User will still see a Subscription value callback exception that is internal to ophyd.areadetector.base.

Nothing we can do about that here. User should be advised to enable the image plugin and acquire an image after which the error message will not appear.

[MDecarabas]

Looks good, let's add somewhere a place about how to use this function. Maybe inside the docstring

[prjemian]

Documentation is here: https://bcda-aps.github.io/apstools/latest/examples/ho_list_control_objects.html#listdevice()-function

[prjemian]

The workflow failure after the merge will be resolved by another PR.

• workflow started failing this week #1016