Updated mediawiki/extensions
Project: mediawiki/extensions/TemplateData  50bbd93e6afe9b435fb41737377ff56217f11ba2

Fix roundtrip issues (normalised output for API must be valid input)

For example, in case of failure we were defaulting to an empty
object, even though that is invalid input.

Change-Id: I00b4ce26b04ec408b5e86b9a2242cf942300ad41