fix: separate diagnostics gui log and accept ntfs prefix alias

LiamNtfs/C4IT.LIAM.Ntfs.cs

@@ -467,10 +467,18 @@ namespace C4IT.LIAM
 
         private string GetRequiredCustomTag(string key)
         {
-            if (!CustomTags.TryGetValue(key, out var value))
-                throw new InvalidOperationException($"Missing NTFS custom tag '{key}'.");
+            if (CustomTags.TryGetValue(key, out var value) && !string.IsNullOrWhiteSpace(value))
+                return value;
+
+            if (string.Equals(key, "Filesystem_GroupPrefixTag", StringComparison.OrdinalIgnoreCase)
+                && CustomTags.TryGetValue("ADGroupPrefix", out value)
+                && !string.IsNullOrWhiteSpace(value))
+            {
+                return value;
+            }
+
+            throw new InvalidOperationException($"Missing NTFS custom tag '{key}'.");
 
-            return value;
         }