Revert "qml: silence undefined property errors when not really used"

This reverts commit ba51cef0d5.

electrum/gui/qml/components/History.qml

@@ -131,9 +131,7 @@ Pane {
         Label {
             id: postext
             anchors.centerIn: parent
-            text: vdragscroll.drag.active
-                    ? listview.itemAt(0,listview.contentY + (dragb.y + dragb.height/2)).delegateModel.date
-                    : ''
+            text: listview.itemAt(0,listview.contentY + (dragb.y + dragb.height/2)).delegateModel.date
             font.pixelSize: constants.fontSizeLarge
         }
     }