Simplify logic in show_command_in_title_bar()

Re-use the case switch

dotfiles/bash/post.bashrc

@@ -70,13 +70,11 @@ case "$TERM" in
                     # In any case nested escapes confuse the terminal, so don't
                     # output them.
                     ;;
+                "")
+                    echo -ne "\033]0;$(__make_ps1d)$__host_id${PWD/$HOME/~}\$\007"
+                    ;;
                 *)
-                    if test -n "${BASH_COMMAND}";
-                    then
-                        echo -ne "\033]0;${BASH_COMMAND} ($__host_id${PWD/$HOME/~})\007"
-                    else
-                        echo -ne "\033]0;$(__make_ps1d)$__host_id${PWD/$HOME/~}\$\007"
-                    fi
+                    echo -ne "\033]0;${BASH_COMMAND} ($__host_id${PWD/$HOME/~})\007"
                     ;;
             esac
         }