message: fixed displayBlanksAs feature and changed default
diff: @@ -74,7 +74,7 @@ if ( NODEJS ) {
  var PptxGenJS = function(){
  // APP
  var APP_VER = "2.3.0-beta";
  - var APP_BLD = "20180625";
  + var APP_BLD = "20180627";
  // CONSTANTS
  var MASTER_OBJECTS = {
  @@ -529,7 +529,7 @@ var PptxGenJS = function(){
  // lineDataSymbol: http://www.datypic.com/sc/ooxml/a-val-32.html
  // Spec has [plus,star,x] however neither PPT2013 nor PPT-Online support them
  if ( ['circle','dash','diamond','dot','none','square','triangle'].indexOf(options.lineDataSymbol || '') < 0 ) options.lineDataSymbol = 'circle';
  - if ( ['gap','span'].indexOf(options.displayBlanksAs || '') < 0 ) options.displayBlanksAs = 'gap';
  + if ( ['gap','span'].indexOf(options.displayBlanksAs || '') < 0 ) options.displayBlanksAs = 'span';
  options.lineDataSymbolSize = ( options.lineDataSymbolSize && !isNaN(options.lineDataSymbolSize ) ? options.lineDataSymbolSize : 6 );
  options.lineDataSymbolLineSize = ( options.lineDataSymbolLineSize && !isNaN(options.lineDataSymbolLineSize ) ? options.lineDataSymbolLineSize * ONEPT : 0.75 * ONEPT );
  // `layout` allows the override of PPT defaults to maximize space
  @@ -2582,7 +2582,7 @@ var PptxGenJS = function(){
  }
  strXml += ' <c:plotVisOnly val="1"/>';
  - strXml += ' <c:dispBlanksAs val="'+ options.displayBlanksAs +'"/>';
  + strXml += ' <c:dispBlanksAs val="'+ rel.opts.displayBlanksAs +'"/>';
  if ( rel.opts.type.name === 'scatter' ) strXml += '<c:showDLblsOverMax val="1"/>';
  strXml += '</c:chart>';
  