Template:Ifndef

Description
Allows conditional code for optional parameters. If the parameter  is undefined, the string   is inserted. The template is the opposite of Template:Ifdef. It is necessary, because the MediaWiki of Sourceforge here has not got the extended parser function like. For further details, look at the Wikipedia pages Template:Ifndef and Help:Advanced templates#Branching techniques without ParserFunctions.

Example
If the parameter  is defined, the code results in nothing. If it is undefined,


 * colspan="2" | Please help to find a URL
 * colspan="2" | Please help to find a URL

is inserted.