Plugin/ImageInfo.pm: avoid warnings: Use of uninitialized value in lc at /usr/local/lib/perl5/site_perl/5.18.0/Mail/SpamAssassin/Plugin/ImageInfo.pm line 231.
Plugin/ImageInfo.pm: avoid warnings: Use of uninitialized value in lc at /usr/local/lib/perl5/site_perl/5.18.0/Mail/SpamAssassin/Plugin/ImageInfo.pm line 231.

git-svn-id: e9fe9b84e32fc5e57b7d09c40cd78b14ea28ed71@1507538 13f79535-47bb-0310-9956-ffa450edef68

apache/spamassassin,apache/spamassassin,apache/spamassassin,apache/spamassassin,apache/spamassassin