fixes that the config could not be loaded and an oversight in ColumnizerPicker

Author: Hirogen

src/LogExpert.Core/Classes/Columnizer/ColumnizerPicker.cs

@@ -63,7 +63,7 @@ public static ILogLineMemoryColumnizer DecideMemoryColumnizerByName (string name
     /// Creates a new instance of the specified columnizer type and loads its configuration from the given directory.
     /// </summary>
     /// <remarks>The method requires that the columnizer type has a public parameterless constructor. If the
-    /// type implements IColumnizerConfigurator, its configuration is loaded from the specified directory. If these
+    /// type implements IColumnizerConfiguratorMemory, its configuration is loaded from the specified directory. If these
     /// conditions are not met, the method returns null.</remarks>
     /// <param name="columnizer">The columnizer instance whose type will be cloned. If null, the method returns null.</param>
     /// <param name="directory">The directory path from which to load the configuration for the new columnizer instance.</param>
@@ -82,7 +82,7 @@ public static ILogLineMemoryColumnizer CloneMemoryColumnizer (ILogLineMemoryColu
         {
             var o = cti.Invoke([]);
 
-            if (o is IColumnizerConfigurator configurator)
+            if (o is IColumnizerConfiguratorMemory configurator)
             {
                 configurator.LoadConfig(directory);
             }

src/RegexColumnizer/RegexColumnizer.cs

@@ -429,6 +429,11 @@ public void Configure (ILogLineMemoryColumnizerCallback callback, string configD
 
         string filePath = Path.Join(configDir, $"{name}Columnizer.json");
 
+        _config ??= new RegexColumnizerConfig
+        {
+            Name = GetName()
+        };
+
         RegexColumnizerConfigDialog dlg = new(_config);
         if (dlg.ShowDialog() == DialogResult.OK)
         {