EventManager: Check if the container contains the event before allowing subscription or unsubscription.
EventManager: Check if the container contains the event before allowing subscription or unsubscription.

RonnChyran/snowflake,faint32/snowflake-1,RonnChyran/snowflake,SnowflakePowered/snowflake,RonnChyran/snowflake,SnowflakePowered/snowflake,faint32/snowflake-1,faint32/snowflake-1,SnowflakePowered/snowflake