Change 214357 had a related patch set uploaded (by Florianschmidtwelzow):
Correctly determine if a license message should be printed or not

https://gerrit.wikimedia.org/r/214357

With them set to '' I see "Content is available under unless otherwise noted."
Surely this is the correct behaviour?
This patch removes that message altogether. What is the correct behaviour? (please reply on bug)

Hmm, it shouldn't be vsisible when:

• the default value is set (null), which isn't the case actually
• it is set to an empty string, which isn't the case actually
• it's set to false (or any other value which is interpreted as boolean false in php), which isn't the case actually

I tested the change above with:

• $wgRightsText = ''; -> no license message
• $wgRightsText = null; -> no license message
• $wgRightsText = flase; -> no license message
• $wgRightstext = 'Test'; -> license messaeg visible

Can you very that this isn't a local cache issue? :)

@Florian I can confirm yes to all your examples - must have been a cache issue.

Change 214357 merged by jenkins-bot:
Correctly determine if a license message should be printed or not

https://gerrit.wikimedia.org/r/214357