Attempt overwriting existing file, and catch and log failures

src/ImageProcessor.Web/Caching/DiskCache.cs

@@ -180,14 +180,19 @@ public override async Task AddImageToCacheAsync(Stream stream, string contentTyp
 
             // This is a hack. I don't know why there would ever be double access to the file but there is
             // and it's causing errors to be thrown.
+            // Ensure that an attempt at overwrite is still made, so cached images can be updated
             // https://github.com/JimBobSquarePants/ImageProcessor/issues/629
-            if (!File.Exists(this.CachedPath))
+            try
             {
                 using (FileStream fileStream = File.Create(this.CachedPath, (int)stream.Length))
                 {
                     await stream.CopyToAsync(fileStream).ConfigureAwait(false);
                 }
             }
+            catch (Exception ex)
+            {
+                ImageProcessorBootstrapper.Instance.Logger.Log<DiskCache>($"Unable to write to file: {this.CachedPath}, {ex.Message}");
+            }
         }
 
         /// <summary>