Merlin not staging

[andrewmkiss]

I kept getting an error with our Merlin detector (see 34-merlin)

On stage, at line 109, there is a set_and_wait for setting the file path. This seems to set the path correctly and CSS is showing the correct value, but this function errors out. Basically, attempted to set EpicsPathSignal to value "/epicsdata/merlin/2021/02/10" and timed out after 10 seconds. Current value is "/epicsdata/merlin/2021/02/10/". The difference I can see is the ending slash.

To make things work (for now), I forced a single path and removed this set_and_wait.