Little fix for some weird cookie string like Google Analytics #149
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I had some weird cookie string like '__utmv=XXXXXXX.|4=k4=false=1,;' and this caused following warnings:
Use of uninitialized value $key in exists at /home/homepage/perl5/perlbrew/perls/5.12.1/lib/site_perl/5.12.1/Plack/Request.pm line 78.
Use of uninitialized value $key in hash element at /home/homepage/perl5/perlbrew/perls/5.12.1/lib/site_perl/5.12.1/Plack/Request.pm line 78.
This little commit is for avoiding this warnings.