fix(fish): Don't show error of missing onefetch

fish/config.fish

@@ -143,7 +143,9 @@ function check_directory_for_new_repository
   set current_repository (git rev-parse --show-toplevel 2> /dev/null)
   if [ "$current_repository" ] && \
     [ "$current_repository" != "$last_repository" ]
-    onefetch
+    if type -q onefetch
+      onefetch
+    end
   end
   set -gx last_repository $current_repository
 end