Fixed an error that would show up in the console when a club image couldn't be drawn in certain circumstances

CHANGELOG.md

@@ -23,7 +23,7 @@ Experimental changelog. Mostly based on [keepachangelog](https://keepachangelog.
 - `.slot` redesigned (and updated entries in `images.yml`)
 - Reduced required permissions for .qdel (thanks to tbodt)
 
-## [3.0.7] - 5.10.2021
+## [3.0.7] - 05.10.2021
 
 ### Added
 - `.streamsclear` re-added. It will remove all followed streams on the server.

src/NadekoBot/_Extensions/Extensions.cs

@@ -357,7 +357,7 @@ namespace NadekoBot.Extensions
 
         public static bool IsImage(this HttpResponseMessage msg, out string mimeType)
         {
-            mimeType = msg.Content.Headers.ContentType.MediaType;
+            mimeType = msg.Content.Headers.ContentType?.MediaType;
             if (mimeType == "image/png"
                     || mimeType == "image/jpeg"
                     || mimeType == "image/gif")