Fix handling of undefined printer items in AddLocalPrinterScrollView

This commit addresses an issue wherein undefined current items were not properly handled in the AddLocalPrinterScrollView module. We've changed the code so that it now checks if currentItem and currentItem.name exist before attempting to assign. If they don't exist, we now set default values to avoid null or undefined references. This prevents potential errors or inconsistent behaviors in the UI.

CURA-11003

resources/qml/WelcomePages/AddLocalPrinterScrollView.qml

@@ -32,7 +32,7 @@ Item
 
     onCurrentItemChanged:
     {
-        printerName = currentItem == null ? "" : currentItem.name
+        printerName = currentItem && currentItem.name? currentItem.name: ""
     }
 
     function updateCurrentItemUponSectionChange(section)
@@ -53,12 +53,18 @@ Item
     {
         machineList.currentIndex = index;
         currentItem = machineList.model.getItem(index);
-        if (currentItem != undefined)
+        if (currentItem && currentItem.name)
         {
             machineName.text = currentItem.name
             manufacturer.text = currentItem.metadata["manufacturer"]
             author.text = currentItem.metadata["author"]
         }
+        else
+        {
+            machineName.text = "No printers Found"
+            manufacturer.text = ""
+            author.text = ""
+        }
     }
 
     Component.onCompleted:
@@ -93,7 +99,6 @@ Item
                         id: background
                         color: UM.Theme.getColor("main_background")
                         radius: 2
-                        border.width: 1
                         border.color:  UM.Theme.getColor("primary_button")
                     }
                     height: UM.Theme.getSize("small_button_icon").height*2