If you add an exact comparison to the test it should work:
$t1Inning1 = isset( $instance['t1Inning1'] ) && $instance['t1Inning1'] !== '' ? $instance['t1Inning1'] : '-';
If you add an exact comparison to the test it should work:
$t1Inning1 = isset( $instance['t1Inning1'] ) && $instance['t1Inning1'] !== '' ? $instance['t1Inning1'] : '-';