Fix populating txParams with undefined data

app/scripts/lib/tx-state-manager.js

@@ -108,6 +108,10 @@ module.exports = class TransactionStateManager extends EventEmitter {
   updateTx (txMeta, note) {
     // validate txParams
     if (txMeta.txParams) {
+      if (typeof txMeta.txParams.data === 'undefined') {
+        delete txMeta.txParams.data
+      }
+
       this.validateTxParams(txMeta.txParams)
     }
 

ui/app/send-v2.js

@@ -576,12 +576,17 @@ SendTransactionScreen.prototype.getEditedTx = function () {
       data,
     })
   } else {
-    const data = unapprovedTxs[editingTransactionId].txParams.data
+    const { data } = unapprovedTxs[editingTransactionId].txParams
+
     Object.assign(editingTx.txParams, {
       value: ethUtil.addHexPrefix(amount),
       to: ethUtil.addHexPrefix(to),
       data,
     })
+
+    if (typeof editingTx.txParams.data === 'undefined') {
+      delete editingTx.txParams.data
+    }
   }
 
   return editingTx