NButton: fix issue when no icon defined

Widgets/NButton.qml

@@ -80,10 +80,9 @@ Rectangle {
     spacing: Style.marginXS * scaling
 
     // Icon (optional)
-    Loader {
-      active: root.icon !== ""
-      sourceComponent: NIcon {
+    NIcon {
       Layout.alignment: Qt.AlignVCenter
+      visible: root.icon !== ""
 
       icon: root.icon
       font.pointSize: root.iconSize
@@ -105,7 +104,6 @@ Rectangle {
         }
       }
     }
-    }
 
     // Text
     NText {

Widgets/NIcon.qml

@@ -7,8 +7,12 @@ Text {
   readonly property string defaultIcon: "balloon"
   property string icon: defaultIcon
 
+  visible: (icon !== undefined) && (icon !== "")
   text: {
-    if (icon === undefined || Bootstrap.icons[icon] === undefined) {
+    if ((icon === undefined) || (icon === "")) {
+      return ""
+    }
+    if (Bootstrap.icons[icon] === undefined) {
       Logger.warn("Icon", `"${icon}"`, "doesn't exist in the bootstrap font")
       Logger.callStack()
       return Bootstrap.icons[defaultIcon]