While you remain pre-5.10, you might like this technique: 

use List::Util qw( first );
my $theme = first { defined $_ } (
    $global_config->{modes}{$current_mode}{theme},
    $theme_config->{current_theme},
    $default_theme,
    'none',
);

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In reply to Re: Sequential defined-or operators by Util
in thread Sequential defined-or operators by naikonta

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