Merge pull request #1567 from dfcreative/patch-1

Cast to empty array

Author: etpinard

src/components/errorbars/index.js

@@ -19,7 +19,7 @@ errorBars.calc = require('./calc');
 
 errorBars.calcFromTrace = function(trace, layout) {
     var x = trace.x || [],
-        y = trace.y,
+        y = trace.y || [],
         len = x.length || y.length;
 
     var calcdataMock = new Array(len);

test/jasmine/tests/gl_plot_interact_test.js

@@ -984,6 +984,20 @@ describe('Test gl2d plots', function() {
         .catch(fail)
         .then(done);
     });
+
+    it('should change plot type with incomplete data', function(done) {
+        Plotly.plot(gd, [{}]);
+
+        expect(function() {
+            Plotly.restyle(gd, {type: 'scattergl', x: [[1]]}, 0);
+        }).not.toThrow();
+
+        expect(function() {
+            Plotly.restyle(gd, {y: [[1]]}, 0);
+        }).not.toThrow();
+
+        done();
+    });
 });
 
 describe('Test removal of gl contexts', function() {