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# bad: ternary in void context: 
exists($checked->{Group}{$GroupDN}) ? ($rc_OK=1) : ($rc_OK=check_group
+($GroupDN,0));
...

# also good: ternary in scalar context:
$rc_OK = exists($checked->{Group}{$GroupDN}) ? 1 :  check_group($Group
+DN,0)