Syntax for if

[Chris Coggins]

What is the proper syntax for a comparison at the end of a subroutine to 
stop the script if a certain variable is "0" or ''?

sub routine{
(get data and process it)
if $varA = '' || $varA = "0" {
(stop script, print error message to user)
}
else{
(continue with script)
}
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