Reviewed and applied patch from #4004. Removed one ", which" change since

the resulting change made the trailing clause read as if it applied to
the wrong type.



[SVN r60610]

libs/graph

@@ -1 +1 @@
-Subproject commit c03ffc7c3e2de1d64f7daa378dbf7578ca3bfb26
+Subproject commit dababea605b482798ca2ca4537de45c37ddda044