orderbook is rendered broken if there are orphan limit orders

[zeshanjum]

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Description this issue is in reference to issue # 479. let say if you have limit order from trading account, and that account get deleted from blockchain, those limit order are still their in orderbook locked. now if you want to clear those limit orders (i.e buy or sell when those limit order are in away), the order will not go through, since the trading account associated with those limit order got deleted, (Main account not found). and hence orderbook is not tradable. it will throw a raw error msg. "Order failed: {"errorMessage":"{\"code\":-32000,\"message\":\"Error in receiving oneshot channel: MainAccountNotFound\"}","errorType":"Lambda:Handled"}"

onchainaddress:{esrFTmBAFR1vzbTtqoCbj453geXZAnMLRKRrHorLmxVpsc8UR}

[zeshanjum]

i have a limit sell order at 1.71, almost ~35 pdex from a trading account whih got deleted from blockchain i am unable to buy it from another account.

[jaymansfield]

414