move card: after change of target board target could be invalid

[cloud2018]

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Describe the bug move card: target could be invalid, cause it's not checked after change of target board

To Reproduce

1. Create a board with list L1
2. Create a board without list L1
3. Create a board with a card
4. Open "move card" 4.1 select board: "board with list L1" 4.2 select list: "L1" 4.3 change selected board to "board without list L1" 5: See: List name of target is still L1, even there is no list L1

Expected behavior After changing the target board, clear the target list (or check it)

Perhaps throw an error (some kind of HTTP 400)? This might prevent data loss, ... when using sync clients

Screenshots