Add error handling

Author: CryptologySAC

index.js

@@ -150,29 +150,35 @@ function postTransaction(container, transaction, cb){
   };
 
   let senderAddress = arkjs.crypto.getAddress(transaction.senderPublicKey);
-  getFromNode('http://' + server + '/api/accounts?address=' + senderAddress, function(err, response, body){
-    if(body) {
-      body = JSON.parse(body);
-      if (body.account.secondSignature) {
-        container.prompt({
-          type: 'password',
-          name: 'passphrase',
-          message: 'Second passphrase: ',
-        }, function(result) {
-          if (result.passphrase) {
-            var secondKeys = arkjs.crypto.getKeys(result.passphrase);
-            arkjs.crypto.secondSign(transaction, secondKeys);
-            transaction.id = arkjs.crypto.getId(transaction);
+  getFromNode('http://' + server + '/api/accounts?address=' + senderAddress, 
+    function(err, response, body){
+    // handle the potential error
+    if(err) {
+      vorpal.log('Someting went wrong: '+err);
+
+    } else { 
+      if(body) {
+        body = JSON.parse(body);
+        if (body.account.secondSignature) {
+          container.prompt({
+            type: 'password',
+            name: 'passphrase',
+            message: 'Second passphrase: ',
+          }, function(result) {
+            if (result.passphrase) {
+              var secondKeys = arkjs.crypto.getKeys(result.passphrase);
+              arkjs.crypto.secondSign(transaction, secondKeys);
+              transaction.id = arkjs.crypto.getId(transaction);
 
-          } else {
-            vorpal.log('No second passphrase given. Trying without.');
+            } else {
+              vorpal.log('No second passphrase given. Trying without.');
 
-          }
-        });
-
-      }
-      performPost(); 
-    }
+            }
+          });
+        }
+        performPost(); 
+      } // if(body)
+    } // if(err)  
   });
 }