[HDF5Tomoscan] improve scan_range robustness

tomoscan/esrf/hdf5scan.py

@@ -638,8 +638,9 @@ class HDF5TomoScan(TomoScanBase):
         ):
             rotation_angle = self.rotation_angle
             if rotation_angle is not None:
-                dist_to180 = abs(180 - numpy.max(rotation_angle))
-                dist_to360 = abs(360 - numpy.max(rotation_angle))
+                angle_range = numpy.max(rotation_angle) - numpy.min(rotation_angle)
+                dist_to180 = abs(180 - angle_range)
+                dist_to360 = abs(360 - angle_range)
                 if dist_to180 < dist_to360:
                     self._scan_range = 180
                 else: