tdo not display unknown tx size as zero. fix slider - electrum - Electrum Bitcoin wallet
 (HTM) git clone https://git.parazyd.org/electrum
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       ---
 (DIR) commit efc837b4aae2015028dd66e1928c05bf8430bd67
 (DIR) parent 87cbe443ab8db720c49efc91d000b1a52ae696a1
 (HTM) Author: ThomasV <thomasv@electrum.org>
       Date:   Thu, 21 Dec 2017 11:41:45 +0100
       
       do not display unknown tx size as zero. fix slider
       
       Diffstat:
         M gui/qt/main_window.py               |       3 ++-
       
       1 file changed, 2 insertions(+), 1 deletion(-)
       ---
 (DIR) diff --git a/gui/qt/main_window.py b/gui/qt/main_window.py
       t@@ -1093,7 +1093,7 @@ class ElectrumWindow(QMainWindow, MessageBoxMixin, PrintError):
        
                class TxSizeLabel(QLabel):
                    def setAmount(self, byte_size):
       -                self.setText('x   %s bytes   =' % byte_size)
       +                self.setText(('x   %s bytes   =' % byte_size) if byte_size else '')
        
                self.size_e = TxSizeLabel()
                self.size_e.setAlignment(Qt.AlignCenter)
       t@@ -1630,6 +1630,7 @@ class ElectrumWindow(QMainWindow, MessageBoxMixin, PrintError):
                          self.fee_e, self.feerate_e]:
                    e.setText('')
                    e.setFrozen(False)
       +        self.fee_slider.activate()
                self.size_e.setAmount(0)
                self.set_pay_from([])
                self.tx_external_keypairs = {}