M36 with a filename doesn't return the customInfo if a print job is running

[dc42]

In RRF 3.6.0 post beta 4 if M36 is used with a filename parameter, the contexts of any customInfo comments in the file are normally included in the output. However it does not include the custom info if a job is being run, instead it reports "customInfo":{}. It makes no difference if the print is paused. M36 without a filename parameter does report the customInfo for the job currently running.