Catch HttpRequestException when requesting plugins

Emby.Server.Implementations/Updates/InstallationManager.cs

@@ -148,6 +148,11 @@ namespace Emby.Server.Implementations.Updates
                 _logger.LogError(ex, "An error occurred while accessing the plugin manifest: {Manifest}", manifest);
                 return Array.Empty<PackageInfo>();
             }
+            catch (HttpRequestException ex)
+            {
+                _logger.LogError(ex, "An error occurred while accessing the plugin manifest: {Manifest}", manifest);
+                return Array.Empty<PackageInfo>();
+            }
         }
 
         /// <inheritdoc />