WIP: trade-bot: allow trade-bot entries to be deleted if in BOB_WAITING_FOR_AT_CONFIRM state. Also, return false (instead of throwing internal error) if trade-bot entry does not exist

src/main/java/org/qortal/api/resource/CrossChainResource.java

@@ -1083,8 +1083,11 @@ public class CrossChainResource {
 
 		try (final Repository repository = RepositoryManager.getRepository()) {
 			TradeBotData tradeBotData = repository.getCrossChainRepository().getTradeBotData(tradePrivateKey);
+			if (tradeBotData == null)
+				return "false";
 
 			switch (tradeBotData.getState()) {
+				case BOB_WAITING_FOR_AT_CONFIRM:
 				case ALICE_DONE:
 				case BOB_DONE:
 				case ALICE_REFUNDED: