Exception is raised with default settings if go dependency isn't installed

[Levtastic]

The description for the go option states

prefer go minifier, if optional go dependency is installed (default: True)

This suggests that if the go dependency is not installed, this option will do nothing. Instead, leaving this option as True causes the parsers to raise an exception from here:

flask_minify/flask_minify/parsers.py

Lines 134 to 142 in b7ce727

	if self.has_go_parser and not minify_go:
	raise FlaskMinifyException(
	f"Cannot use any Go parsers without installing "
	"Go optional dependency: `pip install flask-minify[go]`"
	)
	@property
	def has_go_parser(self):
	return any(p.go for p in self.parsers.values())

If a user has a development environment that does not have the extension installed (for example, developing on windows) but still wishes to use the go extension in production, they must explicitly toggle this option based on the code environment, which isn't ideal.

Instead it would be nice if this option was ignored if the go dependency isn't found, as its description suggests it is.

In case it helps anyone else, my current workaround is:

from flask_minify import Minify, parsers
Minify(app, go=bool(parsers.minify_go))

But if it suits your deploy process, you could also do the much simpler:

Minify(app, go=not app.debug)

[mrf345]

Nice catch, and thanks for the thorough description. Should be resolved in 0.48
I've added a few tests to cover this scenario d100773