Changes
Refining demolevel defaulting scheme to enable the undefined case since, as I earlier forgot, templates cannot be passed parameters by ParserFunctions.
<includeonly>{{pp-meta
|type=semi
|small=yes
|demolevel={{{demolevel|undefined}}}
|disallowlevel=sysop
|icon-reason=indefinitely in response to an ongoing high risk of vandalism
|categories={{{categories|{{#switch: {{NAMESPACE}}
| {{ns:2}}
| {{ns:3}} = [[Category:Wikipedia semi-protected user and user talk pages|{{PAGENAME}}]]
| {{ns:6}} = [[Category:Semi-protected images|{{PAGENAME}}]]
| {{ns:4}}
| {{ns:12}} = [[Category:Semi-protected project pages|{{PAGENAME}}]]
| {{ns:100}} = [[Category:Semi-protected portals|{{PAGENAME}}]]
| {{ns:10}} = [[Category:Wikipedia semi-protected templates|{{PAGENAME}}]]
| #default = {{talk other|[[Category:Semi-protected talk pages]]|[[Category:Wikipedia indefinitely semi-protected pages|{{PAGENAME}}]]}}}}}}}}}</includeonly><noinclude>
{{Pp-semi-indef|demospace=main|demolevel=autoconfirmed|categories=no}}
{{pp-template|small=no<!--avoid hiding template-->}}
{{Documentation}}
</noinclude>
|type=semi
|small=yes
|demolevel={{{demolevel|undefined}}}
|disallowlevel=sysop
|icon-reason=indefinitely in response to an ongoing high risk of vandalism
|categories={{{categories|{{#switch: {{NAMESPACE}}
| {{ns:2}}
| {{ns:3}} = [[Category:Wikipedia semi-protected user and user talk pages|{{PAGENAME}}]]
| {{ns:6}} = [[Category:Semi-protected images|{{PAGENAME}}]]
| {{ns:4}}
| {{ns:12}} = [[Category:Semi-protected project pages|{{PAGENAME}}]]
| {{ns:100}} = [[Category:Semi-protected portals|{{PAGENAME}}]]
| {{ns:10}} = [[Category:Wikipedia semi-protected templates|{{PAGENAME}}]]
| #default = {{talk other|[[Category:Semi-protected talk pages]]|[[Category:Wikipedia indefinitely semi-protected pages|{{PAGENAME}}]]}}}}}}}}}</includeonly><noinclude>
{{Pp-semi-indef|demospace=main|demolevel=autoconfirmed|categories=no}}
{{pp-template|small=no<!--avoid hiding template-->}}
{{Documentation}}
</noinclude>