Empty `if` or `else` blocks

You'd think this would never come up, but it's not uncommon:

        Subject: Turning on/off "use diagnostics;"
        Message-Id: <71ln1f$d5m$1@nnrp1.dejanews.com>

        $debug = 0;
        foreach $argv (@ARGV){
          if($argv =~ /^-debug$/) {  
            $debug = 1;  
          } else { 
          }
         }

This else block is not serving any purpose:

        $debug = 0;
        foreach $argv (@ARGV){
          if($argv =~ /^-debug$/) {  
            $debug = 1;  
          }
         }

Empty if or else blocks

Empty `if` or `else` blocks