PR: Make QtBindingsNotFoundError also inherit from ImportError

[cbrnr]

In addition to PythonQtError, QtBindingsNotFoundError now also inherits from ImportError. This should be easier to catch from outside than a generic RuntimeError.

Fixes #412.

[CAM-Gerlach]

Seems like the tests are failing because QtPositioning is no longer included in qt-main as of 6.4.3, unrelated to this PR of course. @dalthviz , should we just skip the test or is there something else we should do about it? It seems unlikely stuff is using it as it seems to be mostly for mobile device sensors and such.

[dalthviz]

I think is okay to skip it 👍 We could use as validation for the skip the using_conda function, so something like:

qtpy/qtpy/tests/test_qsci.py

Lines 9 to 13 in e7a7060

	@pytest.mark.skipif(
	PYSIDE2 or PYSIDE6 or using_conda(),
	reason="Qsci bindings not available under PySide 2/6 and conda installations",
	)
	def test_qsci():

And adding in the reason the link to the PR you shared.

Would you like to help adding the skip @CAM-Gerlach ?

[CAM-Gerlach]

Opened as PR #414 ; @cbrnr once that is merged, this PR can be rebase-ed on master to fix the test here with

git fetch upstream
git switch qtbindingsnotfounderror
git rebase upstream/master
git push --force-with-lease

[dalthviz]

PR #414 is now merged! 🎉

[CAM-Gerlach]

I've gone ahead and used GItHub's built-in "Update Branch" button to update this. @cbrnr , if you need to pull the changes locally, you'll need to do:

git fetch origin
git reset --hard origin/qtbindingsnotfounderror

[dalthviz]

Thank you @cbrnr ! LGTM 👍