Removed if-break when encountering missing cells, simply ommitting missing cells is sufficient

tricco/cubulation_functions.py

@@ -146,9 +146,8 @@ def cubing_next_round(cube_coordinates, visited_triangles, outmost, edge_colours
     for old in outmost: # consider all EnhancedTri's at the border of visited
         for neigh in get_neighbors_of_cell(old.triangle ): # consider all neighbours
             new = EnhancedTri(neigh, 0)
-            if new.triangle == -9999: # use feature: triangles at the grid border claim to be adjacent to -9999
-                break
-            else:
+
+            if new.triangle != -9999: # ommit missing triangles that occur at the grid border (marked by -9999)
                 if new.triangle not in visited_triangles: # EnhancedTri new has no cube_coordinate yet
 
                     # add new to new_outmost for next round hereafter and update visited_triangles