org-ai--openai-get-token broken

[andreas-roehler]

@KaratasFurkan commented on this pull request.

In org-ai-openai.el:

-(defcustom org-ai-openai-api-token nil
+(defcustom org-ai-openai-api-token ""

Hi @andreas-roehler , @rksm , this change breaks the or condition here: https://github.com/andreas-roehler/org-ai/blob/f052119c9f622f1ddb698c08e1ce3bf60b39959f/org-ai-openai.el#L172

The reason is or returns the first non-nil value (e.g. (or nil "" "test") returns ""), which is the empty string in this case.

[andreas-roehler]

The empty string evaluates to boolean t in elisp, which seems a little bit odd, but that's how it is. Fix in preparation.

[rksm]

Thanks for reporting and fixing!

ref #114