home: symlink-manager: Handle non-existing directory during cleanup.

* gnu/home/services/symlink-manager.scm (update-symlinks-script): Handle
non-existing directory during cleanup.

Signed-off-by: Ludovic Courtès <ludo@gnu.org>

gnu/home/services/symlink-manager.scm

@@ -157,6 +157,7 @@ subdirectory from XDG_CONFIG_HOME to generate a target path."
                            #t
                            (G_ "Skipping ~a (not an empty directory)... done\n")
                            directory))
+                         ((= ENOENT errno) #t)
                          ((= ENOTDIR errno) #t)
                          (else
                           (apply throw args)))))))))