missing modification

Author: AntSimi

src/py_eddy_tracker/observations/observation.py

@@ -1330,6 +1330,8 @@ def solve_conflict(cost):
     def solve_simultaneous(cost):
         """Write something (TODO)"""
         mask = ~cost.mask
+        if mask.size == 0:
+            return mask
         # Count number of links by self obs and other obs
         self_links, other_links = sum_row_column(mask)
         max_links = max(self_links.max(), other_links.max())