fix parcoords, fix default colorscale

Author: antoinerg

src/components/colorscale/defaults.js

@@ -48,7 +48,9 @@ module.exports = function colorScaleDefaults(traceIn, traceOut, layout, coerce,
     containerOut.sequential = layoutColorscale.sequential;
     containerOut.sequentialminus = layoutColorscale.sequentialminus;
     var dfltScl = containerOut.diverging;
-    var sclOut = coerce(prefix + 'colorscale', dfltScl);
+    var sclOut;
+    if(dfltScl) sclOut = coerce(prefix + 'colorscale', dfltScl);
+    else sclOut = coerce(prefix + 'colorscale');
 
     // reversescale is handled at the containerOut level
     var reverseScale = coerce(prefix + 'reversescale');

test/jasmine/tests/parcoords_test.js

@@ -141,7 +141,10 @@ describe('parcoords initialization tests', function() {
                 cauto: true,
                 autocolorscale: false,
                 reversescale: false,
-                showscale: false
+                showscale: false,
+                diverging: undefined,
+                sequential: undefined,
+                sequentialminus: undefined
             });
         });
 
@@ -278,6 +281,9 @@ describe('parcoords initialization tests', function() {
                 ]
             }));
 
+            delete(fullTrace.line.diverging);
+            delete(fullTrace.line.sequential);
+            delete(fullTrace.line.sequentialminus);
             expect(fullTrace.line).toEqual({
                 color: [35, 63, 21, 42],
                 colorscale: attributes.line.colorscale.dflt,