fix(sdk-coin-dot): same recipient validation as fixed ticket

Ticket: WP-5728

Author: danielpeng1

modules/sdk-coin-dot/src/dot.ts

@@ -693,36 +693,38 @@ export class Dot extends BaseCoin {
       return true;
     }
 
-    if (!txParams.recipients || txParams.recipients.length === 0) {
-      throw new Error('missing recipients in txParams');
-    }
+    if (txParams.recipients !== undefined) {
+      if (txParams.recipients.length === 0) {
+        throw new Error('missing recipients in txParams');
+      }
 
-    if (Array.isArray(txParams.recipients) && txParams.recipients.length > 1) {
-      throw new Error(
-        `${this.getChain()} doesn't support sending to more than 1 destination address within a single transaction. Try again, using only a single recipient.`
-      );
-    }
+      if (Array.isArray(txParams.recipients) && txParams.recipients.length > 1) {
+        throw new Error(
+          `${this.getChain()} doesn't support sending to more than 1 destination address within a single transaction. Try again, using only a single recipient.`
+        );
+      }
 
-    // validate recipient is same as txBuilder['_to']
-    if (txParams.recipients[0].address !== txBuilder['_to']) {
-      throw new TxIntentMismatchRecipientError(
-        `Recipient address ${txParams.recipients[0].address} does not match transaction destination address ${txBuilder['_to']}`,
-        reqId,
-        [txParams],
-        txPrebuild.txHex,
-        [{ address: txBuilder['_to'], amount: txBuilder['_amount'] }]
-      );
-    }
+      // validate recipient is same as txBuilder['_to']
+      if (txParams.recipients[0].address !== txBuilder['_to']) {
+        throw new TxIntentMismatchRecipientError(
+          `Recipient address ${txParams.recipients[0].address} does not match transaction destination address ${txBuilder['_to']}`,
+          reqId,
+          [txParams],
+          txPrebuild.txHex,
+          [{ address: txBuilder['_to'], amount: txBuilder['_amount'] }]
+        );
+      }
 
-    // validate amount is same as txBuilder['_amount']
-    if (txParams.recipients[0].amount !== txBuilder['_amount']) {
-      throw new TxIntentMismatchRecipientError(
-        `Recipient amount ${txParams.recipients[0].amount} does not match transaction amount ${txBuilder['_amount']}`,
-        reqId,
-        [txParams],
-        txPrebuild.txHex,
-        [{ address: txBuilder['_to'], amount: txBuilder['_amount'] }]
-      );
+      // validate amount is same as txBuilder['_amount']
+      if (txParams.recipients[0].amount !== txBuilder['_amount']) {
+        throw new TxIntentMismatchRecipientError(
+          `Recipient amount ${txParams.recipients[0].amount} does not match transaction amount ${txBuilder['_amount']}`,
+          reqId,
+          [txParams],
+          txPrebuild.txHex,
+          [{ address: txBuilder['_to'], amount: txBuilder['_amount'] }]
+        );
+      }
     }
     return true;
   }