Better UI messaging when searching for all specials in a series

Fixed: Specials season search UI messaging
Closes #881

src/NzbDrone.Core/IndexerSearch/Definitions/SpecialEpisodeSearchCriteria.cs

@@ -1,4 +1,4 @@
-using System;
+using System.Linq;
 
 namespace NzbDrone.Core.IndexerSearch.Definitions
 {
@@ -8,6 +8,13 @@ namespace NzbDrone.Core.IndexerSearch.Definitions
 
         public override string ToString()
         {
+            var episodeTitles = EpisodeQueryTitles.ToList();
+
+            if (episodeTitles.Count > 0)
+            {
+                return string.Format("[{0}] Specials", Series.Title);
+            }
+
             return string.Format("[{0} : {1}]", Series.Title, string.Join(",", EpisodeQueryTitles));
         }
     }