choice tie-break and random fallback + exception cleanup + war<->camp pid

src/warchron/controller/app_controller.py

@@ -111,7 +111,15 @@ class AppController:
         path = self.view.ask_open_file()
         if not path:
             return
-        self.model.load(path)
+        try:
+            self.model.load(path)
+        except RuntimeError as e:
+            QMessageBox.warning(
+                self.view,
+                "Add forbidden",
+                str(e),
+            )
+            return
         self.current_file = path
         self.is_dirty = False
         self.navigation.refresh_players_view()