Improve the text when there is no configuration available

It can happen that the list is empty because the data is still coming or because the connection has been lost.

There are also some improvements in the link to the compatibility chart. Now the two external links in Cura have the same behaviour.

Contributes to CURA-6011.

resources/qml/Menus/ConfigurationMenu/ConfigurationMenu.qml

@@ -199,18 +199,29 @@ Cura.ExpandablePopup
                 text: catalog.i18nc("@label", "See the material compatibility chart")
                 font: UM.Theme.getFont("default")
                 color: UM.Theme.getColor("text_link")
+                linkColor: UM.Theme.getColor("text_link")
                 anchors.left: externalLinkIcon.right
                 anchors.leftMargin: UM.Theme.getSize("narrow_margin").width
+                renderType: Text.NativeRendering
 
                 MouseArea
                 {
                     anchors.fill: parent
+                    hoverEnabled: true
                     onClicked:
                     {
                         // open the material URL with web browser
                         var url = "https://ultimaker.com/incoming-links/cura/material-compatibilty"
                         Qt.openUrlExternally(url)
                     }
+                    onEntered:
+                    {
+                        materialInfoLabel.font.underline = true
+                    }
+                    onExited:
+                    {
+                        materialInfoLabel.font.underline = false
+                    }
                 }
             }
         }