Remove unnecessary checks

Author: JimBobSquarePants

src/ImageSharp.Web.Providers.Azure/Resolvers/AzureBlobStorageImageResolver.cs

@@ -1,7 +1,6 @@
 // Copyright (c) Six Labors.
 // Licensed under the Apache License, Version 2.0.
 
-using System;
 using System.IO;
 using System.Threading.Tasks;
 using Azure;
@@ -26,8 +25,10 @@ public class AzureBlobStorageImageResolver : IImageResolver
         /// <inheritdoc/>
         public async Task<ImageMetadata> GetMetaDataAsync()
         {
+            // I've had a good read through the SDK source and I believe we cannot get
+            // a 304 here since 'If-Modified-Since' header is not set by default.
             Response<BlobProperties> properties = await this.blob.GetPropertiesAsync();
-            return new ImageMetadata(properties?.Value.LastModified.DateTime ?? DateTime.UtcNow);
+            return new ImageMetadata(properties.Value.LastModified.DateTime);
         }
 
         /// <inheritdoc/>