Fix blackhole connection issue #318
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All arguments of the __init__ function of a connection subclass must have a default value.
On systems with Python 3.7+ the blackhole service cashes if an attacker connects to it. This fixes: #314
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ISSUE TYPE
SUMMARY
Fix crash of the blackhole service on systems with Python 3.7+. Also introduce a check to prevent this kind of crashes in the future and to make debugging easier.
Fixes #314