Better error message support for yo-code

[parthsarthiprasad]

I've been having this issue with generator where It throws off an error code without any information about the error message. Rather than just Error code
If there can be development in field of error messages being hit either due to wrongurl or wrongfilepath which can be thrown will be helpful for the use case?

#snippet of the issue

     _-----_     ╭──────────────────────────╮
    |       |    │   Welcome to the Visual  │
    |--(o)--|    │   Studio Code Extension  │
   `---------´   │        generator!        │
    ( _´U`_ )    ╰──────────────────────────╯
    /___A___\   /
     |  ~  |     
   __'.___.'__   
 ´   `  |° ´ Y ` 

? What type of extension do you want to create? New Language Support
Enter the URL (http, https) or the file path of the tmLanguage grammar or press ENTER to start with a new grammar.
? URL or file to import, or none for new: https://github.com/parthsarthiprasad/chapel-tmbundle/blob/tmbundlequotes/Syntaxes/Chapel.tmLanguage
Error code 

undefined

or using rawgithubusercontent

  _-----_     ╭──────────────────────────╮
    |       |    │   Welcome to the Visual  │
    |--(o)--|    │   Studio Code Extension  │
   `---------´   │        generator!        │
    ( _´U`_ )    ╰──────────────────────────╯
    /___A___\   /
     |  ~  |     
   __'.___.'__   
 ´   `  |° ´ Y ` 

? What type of extension do you want to create? New Language Support
Enter the URL (http, https) or the file path of the tmLanguage grammar or press ENTER to start with a new grammar.
? URL or file to import, or none for new: https://raw.githubusercontent.com/parthsarthiprasad/chapel-tmbundle/tmbundlequotes/Syntaxes/Chapel.tmLanguage
Error code 

undefined

https://raw.githubusercontent.com/parthsarthiprasad/chapel-tmbundle/tmbundlequotes/Syntaxes/Chapel.tmLanguage

[parthsarthiprasad]

Do let me know about the possibility and also I'll be happy to contribute for the same if possible(If there are good first issues, I'd also like to try them)

And adding to that it seems that vscode doesn't work well with tmlanguage without json #100 ?

[aeschli]

fixed by 4e72a48