Black 26 enforces the number of blank lines for imports.
The goal was to ensure one was added, but it has the side effect
to remove one line when the "import" keyword is encountered.
Nasqueron style put 2 by coherence with functions separators.
This change does two things to create a new coherent Black-compliant style:
- Apply Black 26
- Remove extra lines added previously to have a rhythm of 2 2 to 1 1