Add check for greater than one point to scatter fill

Author: rreusser

src/traces/scatter/plot.js

@@ -224,7 +224,7 @@ function plotOne(gd, idx, plotinfo, cdscatter, cdscatterAll, element, transition
         else if(line.shape === 'spline') {
             pathfn = revpathbase = function(pts) {
                 var pLast = pts[pts.length - 1];
-                if(pts.length > 2 && pts[0][0] === pLast[0] && pts[0][1] === pLast[1]) {
+                if(pts.length > 1 && pts[0][0] === pLast[0] && pts[0][1] === pLast[1]) {
                     // identical start and end points: treat it as a
                     // closed curve so we don't get a kink
                     return Drawing.smoothclosed(pts.slice(1), line.smoothing);