Changes file for bug8231 (duplicate directory guards)

diff --git a/changes/bug8231 b/changes/bug8231
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+  o Major bugfixes:
+    - When unable to find any working directory nodes to use as a
+      directory guard, give up rather than adding the same non-working
+      nodes to the list over and over. Fixes bug 8231; bugfix on
+      0.2.4.8-alpha.