Fix for % (percent) unit (missing unary operator "%")

[30350n]

If using the newest version from master, adding a PartParameter with a PartParameterTemplate that uses % as its unit results in a pint.errors.DefinitionSyntaxError: missing unary operator "%" error.

This seems to be a pint issue (see pint #1758) which is sadly still present on pint 0.22 and 0.23. The user who created the mentioned issue provided a workaround though, which this patch applies. Imo this is the way to go for now, because otherwise the % unit is just unusable.

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[SchrodingersGat]

@30350n thanks for the fix, and nice addition of unit tests :)

[30350n]

No problem! :) Just fixed the fomatting, Style checks should pass now hopefully.

[SchrodingersGat]

Thanks for the contribution :)

[github-actions]

💔 All backports failed

Status	Branch	Result
❌	0.12.x	Backport failed because of merge conflicts

Manual backport

To create the backport manually run:

backport --pr 5527

Questions ?

Please refer to the Backport tool documentation and see the Github Action logs for details

[lafrech]

I believe the workaround I proposed in hgrecco/pint#1758 is not needed anymore since Pint 0.23.