Template:None exists/doc

Usage
If all the numbered parameters (up to  but easily extensible) do not exist as page names, returns the parameter , if any, else returns the parameter   if any.

Examples:
 * {None exists|Bread|Butter|then=hungry|else=full}


 * {None exists|Zread|Zupper|then=hungry|else=full}

Note
While technically it is possible to pass some higher level parameters using 5=xxx, or possibly blanks using |||, the template assumes that parameters are sequential starting at 1