When the ipynb or pdf variables are missing from a lesson's config.yaml, building a lesson results in an error that is not very clear about what is going wrong:
Error in if (cfg$ipynb) { : argument is of length zero
which is the error you get when passing NULL in if().
We could make this error message clearer to notify the user about the missing value.
Alternatively, we could make it so that when the value is missing, we can treat it as being equivalent to FALSE.
When the
ipynborpdfvariables are missing from a lesson'sconfig.yaml, building a lesson results in an error that is not very clear about what is going wrong:which is the error you get when passing
NULLinif().We could make this error message clearer to notify the user about the missing value. Alternatively, we could make it so that when the value is missing, we can treat it as being equivalent to
FALSE.