do not log error if $r->variable was not found

src/http/modules/perl/nginx.xs

diff --git a/src/http/modules/perl/nginx.xs b/src/http/modules/perl/nginx.xs
index 8a20c43..0c2c9b6 100644
--- a/src/http/modules/perl/nginx.xs
+++ b/src/http/modules/perl/nginx.xs
@@ -902,9 +902,6 @@
             XSRETURN_UNDEF;
         }
 
-        ngx_log_error(NGX_LOG_ERR, r->connection->log, 0,
-                      "variable \"%V\" not found", &var);
-
         XSRETURN_UNDEF;
     }