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:
- Statistics
summary: 'Report malloc() stats'
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Description
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This module collects stats from `util.pposix.meminfo` usage and reports using Prosody 0.12 APIs