Return empty change set

api/s6_pumps.py

@@ -6,9 +6,9 @@ import utility
 
 def add_pump(name: str, id: str, node1: str, node2: str) -> ChangeSet:
     if not is_node(name, node1):
-        return
+        return ChangeSet()
     if not is_node(name, node2):
-        return
+        return ChangeSet()
 
     sql = f"insert into pumps (id, node1, node2) values ('{id}', '{node1}', '{node2}'');"
     undo_sql = f'delete from pumps where id = "{id}";'
@@ -21,11 +21,11 @@ def _get_pump(name: str, id: str) -> Row | None:
 
 def delete_pump(name: str, id: str) -> ChangeSet:
     if not is_pump(name, id):
-        return
+        return ChangeSet()
 
     row = _get_pump(name, id)
     if row == None:
-        return
+        return ChangeSet()
 
     node1, node2 = row['node1'], row['node2']
 
@@ -53,25 +53,25 @@ def get_pump_pattern(name: str, id: str) -> str | None: pass
 
 def _set_pump(name: str, id: str, key: str, key_type: str, value: str, optional: bool = False) -> ChangeSet:
     if not is_pump(name, id):
-        return
+        return ChangeSet()
 
     row = _get_pump(name, id)
     if row == None:
-        return
+        return ChangeSet()
 
     return utility.update(name, PUMP, 'pumps', 'id', id, key, key_type, row[key], value, optional)
 
 
 def set_pump_node1(name: str, id: str, node1: str) -> ChangeSet:
     if not is_node(name, node1):
-        return
+        return ChangeSet()
 
     return _set_pump(name, id, 'node1', 'str', str(node1))
 
 
 def set_pump_node2(name: str, id: str, node2: str) -> ChangeSet:
     if not is_node(name, node2):
-        return
+        return ChangeSet()
 
     return _set_pump(name, id, 'node2', 'str', str(node2))