Handle undetected discs on refresh (fixes #461)

CHANGELIST.md

@@ -72,6 +72,7 @@
 - Can't publish single file for UI
 - Handle missing extension gracefully
 - Fix incorrect option slider display
+- Handle undetected discs on refresh
 
 ### 2.4 (2022-10-26)
 

MPF.Core/Data/Drive.cs

@@ -145,6 +145,12 @@ namespace MPF.Core.Data
                 this.TotalSize = driveInfo.TotalSize;
                 this.VolumeLabel = driveInfo.VolumeLabel;
             }
+            else
+            {
+                this.DriveFormat = string.Empty;
+                this.TotalSize = default;
+                this.VolumeLabel = string.Empty;
+            }
         }
 
         #region Public Functionality