How to check it a $Var is empty

[Tim Musson]

perlers,

I want to split to @Group only if the 3rd element of @Line has data.
It works, but I get an error (Use of uninitialized value in split)
using -w, strict, and diagnostics. Should I be doing this differently?

I run this with a filename parm, and the file contains:
uid1,cn 1,ua_bit_essd
uid2,cn 2,ua_bit_essd_si
uid3,cn 3,

I would like to put nothing in $Group[-1] if $Line[2] is empty.

while (<>) { chomp;
    my @Line = split(/,/);
    
    my @Group = split(/_/, $Line[2]) if ($Line[2]); # err msg here for uid3
    
    print "\n", $Line[0], $Line[1], " $Group[-1]"; # testing
}

Thanks!

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