From 929eb9dc6cc65d1ff47ff21dcb9fa5974a9278ee Mon Sep 17 00:00:00 2001
From: "Wladimir J. van der Laan" <laanwj@gmail.com>
Date: Thu, 30 Jun 2011 17:32:19 +0200
Subject: [PATCH] show an error if amount is not valid (either the amount or
 decimals is empty)

---
 src/qt/bitcoinamountfield.cpp | 2 ++
 src/qt/sendcoinsdialog.cpp    | 4 ++--
 2 files changed, 4 insertions(+), 2 deletions(-)

diff --git a/src/qt/bitcoinamountfield.cpp b/src/qt/bitcoinamountfield.cpp
index 8166ce6e6ec..a4cbbe0a7eb 100644
--- a/src/qt/bitcoinamountfield.cpp
+++ b/src/qt/bitcoinamountfield.cpp
@@ -49,6 +49,8 @@ void BitcoinAmountField::setText(const QString &text)
 
 QString BitcoinAmountField::text() const
 {
+    if(amount->text().isEmpty() || decimals->text().isEmpty())
+        return QString();
     return amount->text() + QString(".") + decimals->text();
 }
 
diff --git a/src/qt/sendcoinsdialog.cpp b/src/qt/sendcoinsdialog.cpp
index 33d9a25477c..d83962d1bd9 100644
--- a/src/qt/sendcoinsdialog.cpp
+++ b/src/qt/sendcoinsdialog.cpp
@@ -48,10 +48,10 @@ void SendCoinsDialog::on_sendButton_clicked()
 
     valid = GUIUtil::parseMoney(payAmount, &payAmountParsed);
 
-    if(!valid)
+    if(!valid || payAmount.isEmpty())
     {
         QMessageBox::warning(this, tr("Send Coins"),
-            tr("The amount to pay must be a valid number."),
+            tr("Must fill in an amount to pay."),
             QMessageBox::Ok, QMessageBox::Ok);
         return;
     }