API collector: high CPU load even if no message are processed

The API collector is consuming a lot of CPU, up to 100%, independent of the actual message load. strace shows, that the bot is always polling redis, for the stats (which are written after the process execution).

The problem is, that the bot declares

intelmq/intelmq/bots/collectors/api/collector_api.py

Line 40 in f2b07f6

__collector_empty_process: bool = True

but this attribute is part of the Bot class:

intelmq/intelmq/lib/bot.py

Line 114 in f2b07f6

__collector_empty_process: bool = False

and should therefore be called _Bot__collector_empty_process to be effective. And actually, this should just be called _collector_empty_process