The Binding of Isaac: Antibirth Wiki

I have a problem with this template. When you put it on a page, you must place a parameter. Does anyone know how to prevent this?
For example: {{RebirthWiki}} yields this.

Pickup Rules Card icon.png This article is about the changes of "The Binding of Isaac: Antibirth". For the main page, see Template talk:RebirthWiki.

Derugon (talk) 09:39, 29 December 2016 (UTC)

It should be fixed now; if {{{1}}} is undefined, {{{1|}}} will turn into an empty string but {{{1}}} will stay as {{{1}}}. --Exschwasion (talk) 10:17, 29 December 2016 (UTC)
Thank you very much! Derugon (talk) 10:19, 29 December 2016 (UTC)