nl_tokens: adjusts an axis default range [ h () + 1 1 ] if a NullValueSeparator is set
pl_tokens: function getRange ( ) { if ( __ . nullValueSeparator == "bottom" ) { return [ h ( ) + 1 - __ . nullValueSeparatorPadding . bottom - __ . nullValueSeparatorPadding . top , 1 ] ; } else if ( __ . nullValueSeparator == "top" ) { return [ h ( ) + 1 , 1 + __ . nullValueSeparatorPadding . bottom + __ . nullValueSeparatorPadding . <mask> ] ; } return [ h ( ) + 1 , 1 ] ; }