Fallback to apiURL if javadocioUrl does not exist

[valencik]

Of note, this will yield a URL that does not exist when:

• You run this on a dirty git workspace and thus have a timestamp as part of your snapshot
• You run this on a commit that has not had a snapshot published

[armanbilge]

You run this on a dirty git workspace and thus have a timestamp as part of your snapshot

I'd say this falls into case (2), when it's unpublished. Timestamped snapshots are also publishable :)

[armanbilge]

Noice. Thanks!