update geojson util calcTraceToLineCoords to use BADNUM

- to make it work post scattergeo calcdata 1-1 with lon/lat items
- N.B. this break scattermapbox line trace with gaps
  (to be fix on other branch)

Author: etpinard

src/lib/geojson_utils.js

@@ -9,6 +9,8 @@
 
 'use strict';
 
+var BADNUM = require('../constants/numerical').BADNUM;
+
 /**
  * Convert calcTrace to GeoJSON 'MultiLineString' coordinate arrays
  *
@@ -21,18 +23,19 @@
  *
  */
 exports.calcTraceToLineCoords = function(calcTrace) {
-    var trace = calcTrace[0].trace,
-        connectgaps = trace.connectgaps;
+    var trace = calcTrace[0].trace;
+    var connectgaps = trace.connectgaps;
 
-    var coords = [],
-        lineString = [];
+    var coords = [];
+    var lineString = [];
 
     for(var i = 0; i < calcTrace.length; i++) {
         var calcPt = calcTrace[i];
+        var lonlat = calcPt.lonlat;
 
-        lineString.push(calcPt.lonlat);
-
-        if(!connectgaps && calcPt.gapAfter && lineString.length > 0) {
+        if(lonlat[0] !== BADNUM && lonlat[1] !== BADNUM) {
+            lineString.push(lonlat);
+        } else if(!connectgaps && lineString.length > 0) {
             coords.push(lineString);
             lineString = [];
         }