map returns a list so the solution to your missing value conundrum is to return an empty list for suppressed values. I'm not sure I'd solve this particular problem using a map and the following technique, but the technique is worth knowing about in any case:
use strict;
use warnings;
my %info = map {chomp; my @parts = split '=';
@parts == 2 && length $parts[1] ? @parts : ()
} <DATA>;
print "$_: $info{$_}\n" for sort keys %info;
__DATA__
key=value
nokey=
Prints:
key: value
True laziness is hard work
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