invite list: fixes fallback avatars

- adds fallback avatars for invites
- uses fallback avatar image file for contacts and invites with
  only ringIds

Change-Id: Ia7b702b17533a7aeccb777b3d851420327392b63
Reviewed-by: Kateryna Kostiuk <kateryna.kostiuk@savoirfairelinux.com>
diff --git a/src/delegates/ImageManipulationDelegate.h b/src/delegates/ImageManipulationDelegate.h
index 59acf1e..ebc1a0d 100644
--- a/src/delegates/ImageManipulationDelegate.h
+++ b/src/delegates/ImageManipulationDelegate.h
@@ -67,6 +67,7 @@
     private:
         //Helper
         QPixmap drawDefaultUserPixmap(const QSize& size, const char color, const char letter);
+        QPixmap drawDefaultUserPixmapUriOnly(const QSize& size, const char color);
         CGImageRef resizeCGImage(CGImageRef image, const QSize& size);
 
         QHash<QString, QPixmap> m_hDefaultUserPixmap;