Make sure uzbl is run even on empty URI list

Added feature to *uba* to launch browser even if list of URIs on stdin
ends up empty (that is, zero size or only empty lines).

dotfiles/i3/config

@@ -182,7 +182,7 @@ mode "caps" {
 ### MINE
 bindsym $mod+Return         exec "urxvt"
 bindsym $mod+Shift+Return   exec "xfce4-terminal"
-bindsym $mod+b              exec "saturnin www -1 | head -1 | uba"
+bindsym $mod+b              exec "saturnin www -1 | head -1 | uba -r"
 bindsym $mod+Shift+b        exec "saturnin www -1 | uba"
 bindsym $mod+i              exec "saturnin conf -j -S www.ini | saturnin dmenu -l 20 --split = | uba"
 bindsym $mod+Shift+i        exec "cat .local/share/uzbl/history | saturnin dmenu -l 20 --split-field 3 | uba"