Board Thread:Support Requests - Getting Technical/@comment-4347751-20130711171531/@comment-1330470-20130711195150

will display "alt-text" if "Variable" is not defined. will display nothing in that case.

However, with something like an infobox you might have to go one step further. The above method could be used, at best, to replace blanked rows with "Adoptive Parents: Unknown" or something. If you want to remove the row entirely when it is blanked, you will have to do the following:

Depending on whether any text is located after the #if: (that is, whether "Variable" is defined or not) it changes the content. For example:

This is an example row from an infobox, which will be hidden if the corresponding variable is not defined. Notice that where a pipe | would be used in the table syntax, it must instead be replaced with Template:!, a template found on every wiki on Wikia, which simply produces a pipe. This is because pipes are used in the original #if syntax (see above) and any further will break the syntax.