texttemplate: fix GL traces with txt array longer than data

Author: antoinerg

Diff for: src/traces/scatter3d/convert.js

@@ -246,7 +246,7 @@ function convertPlotlyOptions(scene, data) {
         var d3locale = scene.fullLayout._d3locale;
         if(Array.isArray(data.texttemplate)) {
             text = new Array(data.texttemplate.length);
-            for(i = 0; i < data.texttemplate.length; i++) {
+            for(i = 0; i < Math.min(len, data.texttemplate.length); i++) {
                 var pt = {};
                 pt.text = text[i];
                 appendArrayPointValue(pt, data, i);

Diff for: src/traces/scattergl/convert.js

@@ -119,7 +119,7 @@ function convertTextStyle(trace, gd) {
         optsOut.text = [];
         var pt;
         if(Array.isArray(texttemplate)) {
-            for(i = 0; i < texttemplate.length; i++) {
+            for(i = 0; i < Math.min(texttemplate.length, count); i++) {
                 pt = {};
                 appendArrayPointValue(pt, trace, i);
                 optsOut.text.push(Lib.texttemplateString(texttemplate[i], pt, d3locale, pt));

Diff for: test/image/mocks/gl2d_texttemplate.json

@@ -11,6 +11,15 @@
       "xaxis": "x2",
       "yaxis": "y2"
     }, {
+        "type": "scattergl",
+        "mode": "markers+text",
+        "x": [3, 2, 1, 0],
+        "y": [0, 1, 4, 9],
+        "text": ["1", "2", "3"],
+        "textposition": "top center",
+        "xaxis": "x2",
+        "yaxis": "y2"
+    },{
       "type": "scatterpolargl",
       "mode": "markers+text",
       "text": ["A", "B", "C", "D"],