update envs, default sim_ws to none

wpbonelli · wpbonelli · commit 81a5f2a1ab8a · 2025-05-15T08:31:54.000-04:00
diff --git a/flopy4/mf6/simulation.py b/flopy4/mf6/simulation.py
@@ -11,7 +11,7 @@
 
 @xattree
 class Simulation(Component):
-    sim_ws: Path = field()
+    sim_ws: Path = field(default=None)
     models: dict[str, Model] = field()
     exchanges: dict[str, Exchange] = field()
     solutions: dict[str, Solution] = field()
