无效的十六进制值 `colour='#00ff0g'` 会引发 `ValueError`，而不是未知颜色警告

• I have marked all applicable categories:
  • exception-raising bug
  • visual output bug
• I have visited the [source website], and in particular read the [known issues]
• I have searched through the [issue tracker] for duplicates
• I have mentioned version numbers, operating system and environment, where applicable:

import tqdm, sys
print(tqdm.__version__, sys.version, sys.platform)

Bar.colour treats unknown names as a warning (KeyError / AttributeError → TqdmWarning, bar continues uncoloured). A 7-character #...... string that is not valid hex goes through int(..., 16) and raises ValueError, which is not caught.