compile config: null doesn't overwrite parameter in params.yaml

[grst]

It has been noted that setting a parameter in the params.in.yaml to null doesn't overwrite the same parameter in the params.yaml:

params.in.yaml

dso:
quarto:
   watermark:
     text: null
     testing: 2

params.yaml

    watermark:
     text: NOT QCed
     testing: 2

-> This needs to be fixed/adapted in hiyapyco

[grst]

Also contribute changes back to Hiyapyco

[grst]

Attempted to address this upstream in zerwes/hiyapyco#78

[grst]

Depends on upstream release then we can "unvendor" this.

[grst]

v0.7 is there