Shutup LinkPreviewDelegate

Make sure that the console isn't spammed having `linkpreviewer` undefined in `LinkPreviewDelegate`, even though it shouldn't ever be and I couldn't find any case where it was but my console was still intermittently getting spammed.

src/linkpreviewer.cpp

@@ -93,4 +93,9 @@ void LinkPreviewer::loadUrlPreview()
     }
 }
 
+bool LinkPreviewer::empty() const
+{
+    return m_url.isEmpty();
+}
+
 #include "moc_linkpreviewer.cpp"

src/linkpreviewer.h

@@ -44,6 +44,13 @@ class LinkPreviewer : public QObject
      */
     Q_PROPERTY(QUrl imageSource READ imageSource NOTIFY imageSourceChanged)
 
+    /**
+     * @brief Whether the there is a link to preview.
+     *
+     * A linkPreviwer is empty if the URL is empty.
+     */
+    Q_PROPERTY(bool empty READ empty NOTIFY emptyChanged)
+
 public:
     explicit LinkPreviewer(QObject *parent = nullptr, const NeoChatRoom *room = nullptr, const QUrl &url = {});
 
@@ -53,6 +60,7 @@ public:
     [[nodiscard]] QString title() const;
     [[nodiscard]] QString description() const;
     [[nodiscard]] QUrl imageSource() const;
+    [[nodiscard]] bool empty() const;
 
 private:
     const NeoChatRoom *m_currentRoom = nullptr;
@@ -71,5 +79,6 @@ Q_SIGNALS:
     void descriptionChanged();
     void imageSourceChanged();
     void urlChanged();
+    void emptyChanged();
 };
 Q_DECLARE_METATYPE(LinkPreviewer *)

src/qml/Component/Timeline/LinkPreviewDelegate.qml

@@ -23,7 +23,7 @@ Loader {
      *  - description - the description of the URL preview.
      *  - imageSource - a source URL for the preview image.
      */
-    property var linkPreviewer
+    required property var linkPreviewer
 
     /**
      * @brief Standard height for the link preview.
@@ -39,7 +39,7 @@ Loader {
     property bool indicatorEnabled: false
 
     visible: active
-    sourceComponent: linkPreviewer.loaded ? linkPreviewComponent : loadingComponent
+    sourceComponent: linkPreviewer && linkPreviewer.loaded ? linkPreviewComponent : loadingComponent
 
     Component {
         id: linkPreviewComponent
@@ -61,10 +61,10 @@ Loader {
                     color: Kirigami.Theme.highlightColor
                 }
                 Image {
-                    visible: linkPreviewer.imageSource
+                    visible: root.linkPreviewer.imageSource
                     Layout.maximumHeight: root.defaultHeight
                     Layout.maximumWidth: root.defaultHeight
-                    source: linkPreviewer.imageSource
+                    source: root.linkPreviewer.imageSource
                     fillMode: Image.PreserveAspectFit
                 }
                 ColumnLayout {

src/qml/Component/Timeline/MessageDelegate.qml

@@ -68,7 +68,7 @@ TimelineContainer {
         }
         LinkPreviewDelegate {
             Layout.fillWidth: true
-            active: !currentRoom.usesEncryption && currentRoom.urlPreviewEnabled && Config.showLinkPreview && root.showLinkPreview
+            active: !currentRoom.usesEncryption && currentRoom.urlPreviewEnabled && Config.showLinkPreview && root.showLinkPreview && !root.linkPreview.empty
             linkPreviewer: root.linkPreview
             indicatorEnabled: root.isVisibleInTimeline()
         }