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-Obsolete'
summary: Message Carbons
superseded_by: mod_carbons
...

Since Prosody 0.10, this module is [included in Prosody](https://prosody.im/doc/modules/mod_carbons), you will be redirected there shortly.