fix 2 points curve

src/graphics/join/pathSplit.js

@@ -164,7 +164,9 @@ define(
             end = joint[0];
             splitedPaths.push(path.slice(start.index).concat(path.slice(0, end.index + 1)));
 
-            return splitedPaths;
+            return splitedPaths.filter(function (path) {
+                return path.length > 2;
+            });
         }
 
         return pathSplit;

src/graphics/pathJoin.js

@@ -81,7 +81,9 @@ define(
             paths = clipper.execute(relation);
             paths = segment2Bezier(paths, bezierHash);
 
-            return paths.map(function (path) {
+            return paths.filter(function (path) {
+                return path.length > 2;
+            }).map(function (path) {
                 return deInterpolate(path);
             });
         }