Added a check to make sure there is no division by zerro. In case the

gapfile is empty or corrupted, the resulting values will be 0, this
could cause an unwanted alarm.

libexec/check_cpu_usage

@@ -38,8 +38,6 @@ use warnings;
 #-------------------------------------------------------------------------------
 #                     Used Modules
 #-------------------------------------------------------------------------------
-# use lib "/usr/local/nrpe/perl/lib";
-# use Nagios::Plugin;
 use Monitoring::Plugin;
 use Data::Dumper;
 
@@ -137,6 +135,12 @@ sub calculateData
 
     for ( my $i = 0; $i < scalar @$names; $i++ )
     {
+        # in case the gapfile is empty
+        if ( $sum == 0 )
+        {
+            $cpu->[ $i ] = 0;
+            next;
+        }
         $cpu->[ $i ] = $results[ $i ] * 100 / $sum;
     }
     return $cpu;