make the todo call in cd() a hook added conditionally.

This way no error is thrown, when the todo program is missing.

aliases/functions

@@ -50,11 +50,8 @@ cd(){
     if [ -e ".zin" ]; then
         . ".zin"
     fi
-    todo
 }
 
-
-
 #}}}
 
 #################################################################################

modules/todo/init

@@ -8,6 +8,7 @@ if command -v todo >/dev/null; then
 		fi
 		todo ${=file} -f +${1:-high} | wc -l
 	}
+	chpwd_hook todo
 else
 	todo_count() {
 		echo -1