fix: Make axis.min/max behave consistently with series.data and axis.dataMin - illegal values are ignored. The previous behavior (before v6.1.0) is partially reasonable: `axis.min/max: NaN` coincidentally results in correct series rendering but abnormal axisLabel rendering, and cause axis extent to be series min/max. v6.1.0 introduces a breaking - `axis.min: NaN` causes axis to be blank and series not to be rendered. The current behavior is both reasonable and the closest to previous behavior.