fix regression #14715 by adding an additional check for the newly build metadata object (#15198)

src/modules/imageresizer/ui/Extensions/BitmapMetadataExtension.cs

@@ -187,6 +187,31 @@ namespace ImageResizer.Extensions
             }
         }
 
+        /// <summary>
+        /// Detect whether the metadata object is valid and can be copied successfully
+        /// </summary>
+        /// <remarks>
+        /// ImageMetadata.Clone() causes an exception if there is something wrong with the metadata object.
+        /// Operation is rather expensive.
+        /// </remarks>
+        /// <param name="metadata">Metadata object to be checked</param>
+        /// <returns>true if valid, false if invalid</returns>
+        public static bool IsMetadataObjectValid(this BitmapMetadata metadata)
+        {
+            try
+            {
+                _ = metadata.Clone();
+
+                return true;
+            }
+#pragma warning disable CA1031 // Do not catch general exception types
+            catch (Exception)
+#pragma warning restore CA1031 // Do not catch general exception types
+            {
+                return false;
+            }
+        }
+
         /// <summary>
         /// Prints all metadata to debug console
         /// </summary>