Boolean operation for iRule

The code block looks something like this Patrick. I just need something that wraps around it so that when one alert is raised when the pool is empty. Thanks in advance

if {[active_members [LB::server pool]] < 1 } {
    set conn [connect -timeout 100 -idle 30 -status conn_status x.x.x.x:x]
    set postdata "POST /whatever/whatever/ HTTP/1.1\r\n"
    append postdata "Content-Type: application/json;charset=UTF-8\r\n"
    append postdata "Accept: */*\r\n"
    append postdata "Host: x.x.x.x:x\r\n"
    append postdata "accept-encoding: gzip, deflate\r\n"
    append postdata "content-length: $jsonlen\r\n\r\n"
    set send_info [send -timeout 100 -status send_status $conn $postdata]
    set recv_2kbytes [recv -timeout 300 20 $conn]
    set length_recv [string length $recv_2kbytes]
    close $conn