Changes
Switched to use template error-small instead of error in order to not pollute the list of transclusions of the error template in WhatLinksHere
{{#if:{{{1|<noinclude>$</noinclude>}}}|{{Catalog lookup link|{{#expr:{{{1|}}}|}}|{{#expr:{{{2|}}}|}}|{{#expr:{{{3|}}}|}}|{{#expr:{{{4|}}}|}}|{{#expr:{{{5|}}}|}}|{{#expr:{{{6|}}}|}}|{{#expr:{{{7|}}}|}}|{{#expr:{{{8|}}}|}}|{{#expr:{{{9|}}}|}}|article-link={{#ifeq:{{yesno-no|{{{plainlink|}}}}}|yes||Request for Comments (identifier)}}|article-name={{#ifeq:{{yesno-no|{{{plainlink|}}}}}|yes||RFC}}|link-prefix=https://tools.ietf.org/html/rfc|list-leadout={{{leadout|}}}}}|{{error-small|Parameter error in {{tl|IETF RFC}}: Missing [[Request for Comments (identifier)|RFC]].}}}}<noinclude>{{documentation}}<!-- Add categories and interwiki lines to the /doc subpage, not here! --></noinclude>