User:This, that and the other/subst and safesubst/subst

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• Parameter 1: {{{1}}}.
• Parameter 1 or nothing: .
• "YEAH" if parameter 1 set, "AWWW" if parameter 1 not set ({{#if:{{{1|}}}|YEAH|AWWW}}): AWWW
• The same #if switch, but with <includeonly>subst:</includeonly> code: AWWW
• The same #if switch, but with sub<includeonly></includeonly>st: code: {{subst:#if:|YEAH|AWWW}}
• The same #if switch, but with <includeonly>safesubst:</includeonly> code: AWWW

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