blogdown:::new_post_addin() should check for hugo first

[LukasWallrich]

Thanks for the fantastic package.

Not a major issue, but an (apparently) unnecessary annoyance: on a new computer, I just used blogdown:::new_post_addin() to set up a new post, and when I closed the window after entering all the details, it failed with Warning: Error in : hugo 0.81.0 not found. You may try blogdown::install_hugo("0.81.0").

Could that check happen first? Then user input would not get lost.

[yihui]

That makes sense. I just did it. Thanks for suggestion!

Usually the first thing I do when opening a blogdown project is blogdown::serve_site(). This can make sure the site works fine before I do anything else. You can also set options(blogdown.serve_site.startup = TRUE) to do this automatically (which is what I do for my own website).