Log a warning when encountering an empty AssemblyName

Co-authored-by: Copilot <[email protected]>

Author: Jack251970

Flow.Launcher.Core/Plugin/PluginManager.cs

@@ -189,6 +189,7 @@ private static void UpdatePluginDirectory(List<PluginMetadata> metadatas)
                 {
                     if (string.IsNullOrEmpty(metadata.AssemblyName))
                     {
+                        Log.Warn($"Plugin skipped: AssemblyName is empty for plugin with metadata: {metadata.Name}", typeof(PluginManager));
                         continue; // Skip if AssemblyName is not set, which can happen for erroneous plugins
                     }
                     metadata.PluginSettingsDirectoryPath = Path.Combine(DataLocation.PluginSettingsDirectory, metadata.AssemblyName);