fix to avoid parse errors if $TERM is empty

lib/termsupport.zsh

@@ -5,7 +5,7 @@
 function title {
   if [[ "$TERM" == "screen" ]]; then 
     print -Pn "\ek$1\e\\" #set screen hardstatus, usually truncated at 20 chars
-  elif [[ ($TERM =~ "^xterm") ]] || [[ ($TERM == "rxvt") ]] || [[ "$TERM_PROGRAM" == "iTerm.app" ]]; then
+  elif [[ ("$TERM" =~ "^xterm") ]] || [[ ("$TERM" == "rxvt") ]] || [[ "$TERM_PROGRAM" == "iTerm.app" ]]; then
     print -Pn "\e]2;$2\a" #set window name
     print -Pn "\e]1;$1\a" #set icon (=tab) name (will override window name on broken terminal)
   fi