[Minor] Do not add maps from weird data
[Minor] Do not add maps from weird data

Issue: #1143
Reported by: @AlexeySa

AlexeySa/rspamd,AlexeySa/rspamd,AlexeySa/rspamd,AlexeySa/rspamd,AlexeySa/rspamd,AlexeySa/rspamd,AlexeySa/rspamd,AlexeySa/rspamd,AlexeySa/rspamd