Minor refactoring

Icarus/Controllers/Managers/DirectoryManager.cs

@@ -136,7 +136,9 @@ public class DirectoryManager : BaseManager
                     deleted++;
                 }
 
-                curDir = System.IO.Directory.GetParent(curDir).ToString();
+                var parentDirectory = System.IO.Directory.GetParent(curDir);
+
+                curDir = parentDirectory!.ToString();
             }
         }
         catch (Exception ex)

Icarus/Controllers/Managers/SongManager.cs

@@ -3,7 +3,6 @@ using NLog;
 using Icarus.Controllers.Utilities;
 using Icarus.Models;
 using Icarus.Database.Contexts;
-using TagLib.Mpeg4;
 
 namespace Icarus.Controllers.Managers;
 

Icarus/Controllers/v1/SongDataController.cs

@@ -219,11 +219,11 @@ public class SongDataController : BaseController
     {
         #region Properties
         [Newtonsoft.Json.JsonProperty("message")]
-        public string Message { get; set; }
+        public string? Message { get; set; }
         [Newtonsoft.Json.JsonProperty("subject")]
-        public string Subject { get; set; }
+        public string? Subject { get; set; }
         [Newtonsoft.Json.JsonProperty("data")]
-        public List<Song> Songs { get; set; }
+        public List<Song>? Songs { get; set; }
         #endregion
     }
 }