Simplify logic on TestCase.assertExpected()

[datumbox]

🐛 Bug

My IDE spotted a tiny bug/readability issue on the TestCase.assertExpected() method:

vision/test/common_utils.py

Lines 153 to 159 in fdca307

	equal = False
	try:
	equal = self.assertEqual(output, expected, prec=prec)
	except Exception:
	equal = False
	if not equal:
	return accept_output("updated output")

The method TestCase.assertEqual() does not return a value, hence if successful the variable equal will be None. The code still work but it can be simplified to improve readability:

            try:
                self.assertEqual(output, expected, prec=prec)
            except Exception:
                return accept_output("updated output")