Template:Iflabel
From Beyond the Pale
Used to quickly produce a bolded label for an optional parameter in a template.
{{#if: {{{1}}}|'''{{{2}}}'''|}}
where 1 is the parameter to check (e.g. {{{mentor|}}} and 2 is the text of the label (e.g. Mentor).
Therefore, {{iflabel|{{{mentor|}}}|Mentor}} would produce Mentor if {{{mentor|}}} is provided with a value, and remain blank if {{{mentor|}}} is undefined.