mod_mamsub: Prevent nil indexing if message is added to archive of an offline user
mod_mamsub: Prevent nil indexing if message is added to archive of an offline user

amenophis1er/prosody-modules,syntafin/prosody-modules,syntafin/prosody-modules,syntafin/prosody-modules,amenophis1er/prosody-modules,obelisk21/prosody-modules,syntafin/prosody-modules,vince06fr/prosody-modules,amenophis1er/prosody-modules,amenophis1er/prosody-modules,vince06fr/prosody-modules,obelisk21/prosody-modules,vince06fr/prosody-modules,vince06fr/prosody-modules,vince06fr/prosody-modules,obelisk21/prosody-modules,syntafin/prosody-modules,obelisk21/prosody-modules,obelisk21/prosody-modules,amenophis1er/prosody-modules