Hush warning.

        Patch by kareila. 

diffs (13 lines):

diff -r 97837011e5e2 -r 4b6fedbcf117 cgi-bin/LJ/Poll.pm
--- a/cgi-bin/LJ/Poll.pm        Wed Nov 24 19:34:01 2010 +0800
+++ b/cgi-bin/LJ/Poll.pm        Wed Nov 24 19:34:56 2010 +0800
@@ -1437,6 +1437,9 @@ sub process_submission {
             }
         }
 
+        # if $val is still undef here, set it to empty string
+        $val = "" unless defined $val;
+
         # see if the vote changed values
         my $changed = 1;
 
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