odd and uncommon error due to center_of_mass fixed

proxtoolbox/Utilities/OrbitalTomog/array_tools.py

-from numpy import roll, ndarray, floor, iscomplexobj, round
+from numpy import roll, ndarray, floor, iscomplexobj, round, any, isnan, nan_to_num
 from scipy.ndimage.measurements import maximum_position, center_of_mass
 from scipy.fftpack import fftn, fftshift, ifftn, ifftshift
+from warnings import warn
 
 __all__ = ["shift_array", 'roll_to_pos', 'shifted_ifft', 'shifted_fft']
 
@@ -40,6 +41,9 @@ def roll_to_pos(arr: ndarray, y: int = 0, x: int = 0, pos: tuple = None, move_ma
             old = floor(center_of_mass(abs(arr)))
         else:
             old = floor(center_of_mass(arr))
+    if any(isnan(old)):
+        old = nan_to_num(old)
+        warn(Warning("Unexpected error in the calculation of the center of mass, casting NaNs to num"))
     if pos is not None:  # dimension-independent method
         shifts = tuple([int(round(pos[i] - old[i])) for i in range(len(pos))])
         dims = tuple([i for i in range(len(pos))])