add more info out when parsing malformed example
add more info out when parsing malformed example

followyourheart/vowpal_wabbit,followyourheart/vowpal_wabbit,followyourheart/vowpal_wabbit,followyourheart/vowpal_wabbit,followyourheart/vowpal_wabbit,followyourheart/vowpal_wabbit,followyourheart/vowpal_wabbit,followyourheart/vowpal_wabbit,followyourheart/vowpal_wabbit,followyourheart/vowpal_wabbit