[Feature]: Prompt the user that the font has not been loaded #84
Description
Demo URL
No response
Describe the feature
If the user has a configuration but the font has not been loaded, it should prompt the user that the font has not been loaded and print out the corresponding configuration information, such as the parsing path, transform function, etc
why? Because I used electr-vite, its path was internally modified when in use, resulting the cwd in the parsed cutsom.family.src being different from the actual src (actually it is src/renderer).
It's very troublesome for me or any developer to troubleshoot these corner problems