Merge pull request #4861 from crobibero/null-ref

Fix null reference when logging

(cherry picked from commit 93b754c366)
Signed-off-by: Joshua M. Boniface <joshua@boniface.me>

MediaBrowser.Model/Dlna/StreamBuilder.cs

@@ -1033,9 +1033,9 @@ namespace MediaBrowser.Model.Dlna
             {
                 _logger.LogInformation(
                     "Profile: {0}, No video direct play profiles found for {1} with codec {2}",
-                    profile.Name ?? "Unknown Profile",
-                    mediaSource.Path ?? "Unknown path",
-                    videoStream.Codec ?? "Unknown codec");
+                    profile?.Name ?? "Unknown Profile",
+                    mediaSource?.Path ?? "Unknown path",
+                    videoStream?.Codec ?? "Unknown codec");
 
                 return (null, GetTranscodeReasonsFromDirectPlayProfile(mediaSource, videoStream, audioStream, profile.DirectPlayProfiles));
             }