fix warnings when no errors occured in HTML::Tidy::parse

html-tidy-silence-warnings.patch

diff --git a/lib/HTML/Tidy.pm b/lib/HTML/Tidy.pm
index 079c8a8..26ee3b0 100644
--- a/lib/HTML/Tidy.pm
+++ b/lib/HTML/Tidy.pm
@@ -228,9 +228,9 @@ sub parse {
                                                 $self->{config_file},
                                                 $self->{tidy_options}
                                               );
-    utf8::decode($errorblock);
-
     return unless defined $errorblock;
+
+    utf8::decode($errorblock);
     return !$self->_parse_errors($filename, $errorblock, $newline);
 }