Fix QhullError warning (#1063)

neurom/morphmath.py

@@ -33,9 +33,14 @@ from itertools import combinations
 
 import numpy as np
 from scipy.spatial import ConvexHull
-from scipy.spatial.qhull import QhullError
 from scipy.spatial.distance import cdist
 
+try:
+    # The QhulError was moved in scipy >= 1.8 so if the import fails the old location is imported
+    from scipy.spatial import QhullError
+except ImportError:  # pragma: no cover
+    from scipy.spatial.qhull import QhullError
+
 from neurom.core.dataformat import COLS