修改 js报错

@@ -286,13 +286,18 @@
                     this.selection.color = selection.color = this.colors[0];
                 }
 
-                this.sizes = colorSizes[selection.color.value];
                 this.colorSizes = colorSizes;
                 this.thumbnails = thumbnails;
 
                 // 选择默认值
-                this.$emit('feature:color.select', selection.color);
-                this.$emit('feature:size.select', selection.size);
+                if (selection.color) {
+                    this.sizes = colorSizes[selection.color.value];
+                    this.$emit('feature:color.select', selection.color);
+                }
+
+                if (selection.size) {
+                    this.$emit('feature:size.select', selection.size);
+                }
             }
         },
         components: {