More logging when episode file image can't be found for XBMC metadata

src/NzbDrone.Core/MetaData/Consumers/Xbmc/XbmcMetadata.cs

@@ -296,6 +296,8 @@ namespace NzbDrone.Core.Metadata.Consumers.Xbmc
                 return new List<ImageFileResult>();
             }
 
+            try
+            {
                 var screenshot = episodeFile.Episodes.Value.First().Images.SingleOrDefault(i => i.CoverType == MediaCoverTypes.Screenshot);
 
                 if (screenshot == null)
@@ -309,6 +311,13 @@ namespace NzbDrone.Core.Metadata.Consumers.Xbmc
                        new ImageFileResult(GetEpisodeImageFilename(episodeFile.RelativePath), screenshot.Url)
                    };
             }
+            catch (Exception ex)
+            {
+                _logger.Error("Unable to episode image for file: " + Path.Combine(series.Path, episodeFile.RelativePath), ex);
+                
+                return new List<ImageFileResult>();
+            }
+        }
 
         private IEnumerable<ImageFileResult> ProcessSeriesImages(Series series)
         {