"Didn't find a TreeElement for a representedObject associated with the ResourceSidebarPanel." is logged every time the Resource sidebar is shown. This is a regression from Safari 7. We also don't show a default view for the Resource sidebar if the current view (Console) does not support the sidebar.
<rdar://problem/16215048>
Created attachment 225690 [details] Patch
Comment on attachment 225690 [details] Patch r=me
Comment on attachment 225690 [details] Patch Clearing flags on attachment: 225690 Committed r165012: <http://trac.webkit.org/changeset/165012>
All reviewed patches have been landed. Closing bug.