scripts/cd in rvm-1.0.22 vs scripts/cd in rvm-1.0.23

@@ -46,10 +46,10 @@
     }
 
     # This functionality is opt-in by setting rvm_cd_complete_flag=1 in ~/.rvmrc
     # Generic bash cd completion seems to work great for most, so this is only
     # for those that have some issues with that.
-    if [[ ${rvm_cd_complete_flag} = 1 ]] ; then
+    if [[ ${rvm_cd_complete_flag:-0} = 1 ]] ; then
 
       # If $CDPATH is set, bash should tab-complete based on directories in those paths,
       # but with the cd function above, the built-in tab-complete ignores $CDPATH. This
       # function returns that functionality.
       _rvm_cd_complete ()