Update build/node-parserlib.js

MediaQuery mediaType and features needs to be joined trough "and".
Not a big issue but window.matchMedia reports the MediaQuery .text as invalid 

Author: mirceapiturca

build/node-parserlib.js

@@ -1169,7 +1169,7 @@ MediaFeature.prototype.constructor = MediaFeature;
  */
 function MediaQuery(modifier, mediaType, features, line, col){
 
-    SyntaxUnit.call(this, (modifier ? modifier + " ": "") + (mediaType ? mediaType + " " : "") + features.join(" and "), line, col, Parser.MEDIA_QUERY_TYPE);
+    SyntaxUnit.call(this, (modifier ? modifier + " ": "") + (mediaType ? mediaType : "") + (mediaType && features.length > 0 ? " and " : "") + features.join(" and "), line, col, Parser.MEDIA_QUERY_TYPE);
 
     /**
      * The media modifier ("not" or "only")