Nope, something does not add up
So lets see:
No missions whatsoever, no cargo (limpets do not count) - means that in the bubble occasional interdictions would happen, either by pirates or by military.
Both this types of interdiction are harmless provided you behave as explained in post
#8
So while an interdiction might ruin your feng-shui, it will be harmless as in you will be interdicted, but not attacked.
Now, if you are pledged to some power - you might get interdicted and attacked by enemies of your chosen power.
You will also be attacked if you defect a power by assassins sent to hunt you down
You might get interdicted and attacked if you are hostile with a faction - same as above, that faction might send assassins to hunt you down
IF you have bounties you will also be hunted down by bounty hunters.
They will interdict you, so you throttle to zero to submit - let them scan you and move along. This type of interdiction does not happen often enough to be a real annoyance
Also pirates are tied to the bubble.
Go some couple of hundreds lightyears far from the bubble and you will not be bothered