fix test on meanOrientation

tools/tests/test_label.py

@@ -412,7 +412,7 @@ class TestFunctionLabel(unittest.TestCase):
 
     def test_meanOrientation(self):
         # Generate random main direction
-        theta = numpy.radians(random.randrange(0, 360, 1))
+        theta = numpy.radians(random.randrange(30, 300, 1))
         phi = numpy.radians(random.randrange(0, 90, 1))
         # Generate n random vector near the main direction
         n = 1000 #number of vectors