Warning when producing an error message

[markov2]

In lib/Net/HTTP/Methods.pm line 528, you can find

die "Missing newline after chunk data: '$line'"
    if !defined($line) || $line ne "";

On an transmission error, we got

Use of uninitialized value $line in concatenation (.) or string at Net/HTTP/Methods.pm line 528.

The logic seems incorrect:

die "Missing newline after chunk data: '$line'"
   if defined $line && $line ne '';