Revert commit 2c8cc1a4, and fix the problem in a correct way.

src/cdm

@@ -70,22 +70,22 @@ fi
 
 # Default options.
 
-binlist=${binlist:-()}
-namelist=${namelist:-()}
-flaglist=${flaglist:-()}
+[[ -z "${binlist[*]}" ]] && binlist=()
+[[ -z "${namelist[*]}" ]] && namelist=()
+[[ -z "${flaglist[*]}" ]] && flaglist=()
 dialogrc=${dialogrc:-}
 countfrom=${countfrom:-0}
 display=${display:-0}
 xtty=${xtty:-7}
 locktty=${locktty:-no}
-serverargs=${serverargs:-'-nolisten tcp'}
 consolekit=${consolekit:-yes}
 cktimeout=${cktimeout:-30}
+serverargs=${serverargs:-'-nolisten tcp'}
 
 # Offer all available sessions in /etc/X11/Sessions,
 # if binlist if not explicitly set in cdmrc.
 
-if [[ "$binlist" == "()" ]]; then
+if [[ "${#binlist[@]}" == 0 ]]; then
     binlist=($(find /etc/X11/Sessions -maxdepth 1 -type f))
     for ((i=0; i<${#binlist[@]}; i++)); do
         declare flaglist[$i]="X"