Fix 'Consider changing "not len(btn) == 0" to "len(btn) != 0"' issue in anibot\utils\data_parser.py

[lostb053]

CodeFactor found an issue: Consider changing "not len(btn) == 0" to "len(btn) != 0"

It's currently on:
anibot\utils\data_parser.py:628
Commit 50ad687