mod_invites_page: Fix templates including stray inviter name (thanks Menel) The util.interpolation syntax `{var?placeholder}` appears to have been intended as an if-not, but this syntax will always return either the variable or the placeholder-template.

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labels:
- Stage-Alpha
summary: "XEP-0388: Extensible SASL Profile"
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Experimental implementation of [XEP-0388: Extensible SASL Profile]