I am developing a set of Ruby libraries for Wikipedia/MediaWiki access:

* low-level: https://github.com/molybdenum-99/mediawiktory

* high-level (semantic): https://github.com/molybdenum-99/infoboxer

I have a problem with understanding some files.

For example, this one: https://en.wikipedia.org/wiki/File:Logo_of_the_Verkhovna_Rada_of_Ukraine.svg

In UI, the page states the file is actually on commons, but the page itself exists and is accessible.

In API: https://en.wikipedia.org/w/api.php?action=query&titles=File:Logo_of_the_Verkhovna_Rada_of_Ukraine.svg -- it is "completely absent" like it is missing totally. 

In Commons API it is there OK: https://commons.wikimedia.org/w/api.php?action=query&titles=File:Logo_of_the_Verkhovna_Rada_of_Ukraine.svg

Is there a way to tell actually non-existent files from files that are included from commons, through API? Or "just check on commons, in case it is there" is the only way?

Thanks in advance.

V.