BC: Fix delete elements.

src/View/BoundaryCondition/BoundaryConditionWindow.py

@@ -301,6 +301,10 @@ class BoundaryConditionWindow(ASubMainWindow, ListedSubWindow):
             2, self._delegate_node
         )
 
+        table.setSelectionBehavior(QAbstractItemView.SelectRows)
+        table.setAlternatingRowColors(True)
+
+
     def setup_connections(self):
         self.find(QAction, "action_add").triggered.connect(self.add)
         self.find(QAction, "action_del").triggered.connect(self.delete)
@@ -339,6 +343,9 @@ class BoundaryConditionWindow(ASubMainWindow, ListedSubWindow):
 
     def delete(self):
         rows = self.index_selected_rows()
+        if len(rows) == 0:
+            return
+
         self._table.delete(rows)
 
     def sort(self):