[libgames-support] scores: add Context.has_scores()

[Michael Catanzaro <mcatanzaro src gnome org>]

commit f49fd11a90176d281a3b7bd1852904ac8e182efa
Author: Michael Catanzaro <mcatanzaro gnome org>
Date:   Sun Feb 22 11:22:25 2015 -0600

    scores: add Context.has_scores()

 scores/context.vala |    5 +++++
 1 files changed, 5 insertions(+), 0 deletions(-)
---
diff --git a/scores/context.vala b/scores/context.vala
index 271b71e..b254098 100644
--- a/scores/context.vala
+++ b/scores/context.vala
@@ -320,6 +320,11 @@ public class Context : Object
         }
         score_added = false;
     }
+
+    public bool has_scores ()
+    {
+        return scores_per_category.is_empty;
+    }
 }
 
 } /* namespace Scores */