Report which variable fails interpolation when they are mandatory #7866
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This PR enhances the error reporting while interpolating by providing a default error message for mandatory variables when they are not set. The default error message corresponds to the name of the variable itself, so it's easier to point out where the issue is.
I have updated the relevant test accordingly.
This was a quick wordaround to get the variable name in the error message, but if you have other ideas for formatting the error please let me know and I'll see what I can do!
Signed-off-by: Luca Nardelli [email protected]
Resolves #7504