[geary/wip/765516-gtk-widget-conversation-viewer: 71/80] Turn down some warnings the user can't do anything about.

[Michael Gratton <mjog src gnome org>]

commit b95a62d23790f13aae79a7d6f2b63d24ce670bee
Author: Michael James Gratton <mike vee net>
Date:   Fri May 13 11:22:03 2016 +1000

    Turn down some warnings the user can't do anything about.

 .../conversation-viewer/conversation-email.vala    |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/src/client/conversation-viewer/conversation-email.vala 
b/src/client/conversation-viewer/conversation-email.vala
index 6026e78..1a12bc8 100644
--- a/src/client/conversation-viewer/conversation-email.vala
+++ b/src/client/conversation-viewer/conversation-email.vala
@@ -576,12 +576,12 @@ public class ConversationEmail : Gtk.Box {
                         stream, icon_size, icon_size, true, load_cancelled
                     );
                 } else {
-                    warning("Unsupported attachment icon type: %s\n",
+                    debug("Unsupported attachment icon type: %s\n",
                             icon.get_type().name());
                 }
             }
         } catch (Error error) {
-            warning("Failed to load icon for attachment '%s': %s",
+            debug("Failed to load icon for attachment '%s': %s",
                     attachment.id,
                     error.message);
         }