justl doesn't work when justl-pop-to-buffer-on-display is nil

[psibi]

Reproducible with this configuration:

(use-package justl
  :ensure t
  :custom
  (justl-recipe-width 40)
  (justl-pop-to-buffer-on-display nil)
  (justl-include-private-recipes nil))

Steps to reproduce:

• Go to a specific justfile
• M-x justl
• You see a new buffer opened but it's blank. Surprisingly if I close that buffer, the actual justfile has been replaced with the contents that I would expect in the justl buffer.

CC: @bbbscarter

[bbbscarter]

I've put up request to fix this.

Apologies! I've only used 'justl-exec-*' commands, which don't exhibit this behaviour. The fix is simple, as described in the CL.