The following seems to have worked, but for calling on methods, you're probably still stuck (i didn't try, though, so it might work too). Just an example:

my %foo = ( 'bar' => {'baz' => 1} );
print $foo{'baz'}->{'bar'} || 'oops';
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which prints 'oops' because there is no 'bar' in %foo.

Update I misunderstood the question I think, but I tested this below and it still followed the same principle:

my %foo = ( 'bar' => undef );
print $foo{'bar'}->{'baz'} || "oops";
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No warnings under -w or use strict.

local $_ = "0A72656B636148206C72655020726568746F6E41207473754A";
while(s/..$//) { print chr(hex($&)) }
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