Make (non-null) vectors truth-y

[nicoonoclaste]

No description provided.

[nicoonoclaste]

Not sure whether to add a test, or what it should be.

The only thing I can think of is bool(v) == (v.x == 0 and v.y == 0), and that's pretty much literally a copy-paste of the code that implements __bool__.

[AstraLuma]

Given it's used everywhere, I'm going to consider it tested.

[nicoonoclaste]

@astronouth7303 OK, feel free to bors r+ if you reviewed.

[AstraLuma]

bors r+

[bors]

Build failed

• FreeBSD PYTHON:3.6
• FreeBSD PYTHON:3.7
• lint
• Linux python:3.6-slim
• Linux python:3.7-slim
• macOS PYTHON:3.6.8
• macOS PYTHON:3.7.2
• Windows python:3.6-windowsservercore-1809
• Windows python:3.7-windowsservercore-1809

[nicoonoclaste]

bors r=astronouth7303

[bors]

Build succeeded

• docs
• FreeBSD PYTHON:3.6
• FreeBSD PYTHON:3.7
• lint
• Linux python:3.6-slim
• Linux python:3.7-slim
• macOS PYTHON:3.6.8
• macOS PYTHON:3.7.2
• Windows python:3.6-windowsservercore-1809
• Windows python:3.7-windowsservercore-1809