Manage empty shapefiles

Common/util_eddies.py

@@ -58,7 +58,13 @@ class SHPC_class:
             else:
                 orientation = def_orient
 
-            d_init_slice = reader[orientation]["extremum"].record(0).date
+            if len(reader[orientation]["extremum"]) != 0:
+                d_init_slice = reader[orientation]["extremum"].record(0).date
+            else:
+                print(f"__init__: Empty shapefile: {my_shapefile}",
+                      file = sys.stderr)
+                d_init_slice = None
+
             self.d_init.append(d_init_slice)
 
         self._n_dates = np.zeros(self.n_slices, dtype = int)