Can't create .nfo file

[Chris Walker]

Using the code shown here - 
https://github.com/get-iplayer/get_iplayer/wiki/usercmd#metadata - I'm
trying to create a .nfo file but although the xml file is created, I'm
not getting a .nfo file.

If I then run the command manually, I do get one. So I'm assuming that
the creation of the .nfo file is failing because at the point it's
trying to run, there is no xml file.

Am I correct in that assumption? If so, how do I overcome this?

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