Fix infinite loading on an empty query on the Discover Packages page (fix #2278)

Author: marticliment

src/UniGetUI/Interface/SoftwarePages/AbstractPackagesPage.xaml.cs

@@ -369,7 +369,7 @@ private void SourcesTreeView_SelectionChanged(TreeView sender, TreeViewSelection
          * 
          */
 
-        public async Task LoadPackages()
+        public virtual async Task LoadPackages()
         {
             await LoadPackages(ReloadReason.External);
         }

src/UniGetUI/Interface/SoftwarePages/NewDiscoverSoftwarePage.cs

@@ -219,6 +219,11 @@ public override void GenerateToolBar()
             SelectNone.Click += (s, e) => { ClearItemSelection(); };
         }
 
+        public override async Task LoadPackages()
+        {
+            if(QueryBlock.Text.Trim() != "") await LoadPackages(ReloadReason.External);
+        }
+
         public override void GenerateUIText()
         {
             DISABLE_AUTOMATIC_PACKAGE_LOAD_ON_START = true;