flow流程组件删除节点后功能异常

版本：v2.5.3
###  **错误描述**

示例页面avue/examples/element-ui/flow/index.html
![流程示例页面](https://images.gitee.com/uploads/images/2020/0527/162709_d3c5c1a8_7611955.png "屏幕截图.png")
步骤：
1.点击确认删除“节点B”；
2.将“节点A”连接至“节点C”；
3.连线关系异常，如下图：
![流程连线异常](https://images.gitee.com/uploads/images/2020/0527/163007_fd9a2f9b_7611955.png "屏幕截图.png")

###  **异常日志**
 
注意使用MD语法 日志 使用 ``格式化日志，越多详细越好

```
vue.js:8542 Download the Vue Devtools extension for a better development experience:
https://github.com/vuejs/vue-devtools
vue.js:8553 You are running Vue in development mode.
Make sure to turn on production mode when deploying for production.
See more tips at https://vuejs.org/guide/deployment.html
avue.js:8693 connectionDetached {connection: b.Connection, source: div#nodeA.jtk-droppable.jtk-managed.jtk-draggable.jtk-endpoint-anchor.jtk-connected, target: div#nodeC.jtk-droppable.jtk-managed.jtk-draggable.jtk-endpoint-anchor.jtk-connected.jtk-dragged, sourceId: "nodeA", targetId: "nodeB", …}
avue.js:8693 connectionDetached {connection: b.Connection, source: div#nodeC.jtk-droppable.jtk-managed.jtk-draggable.jtk-connected.jtk-dragged, target: div#nodeD.jtk-droppable.jtk-managed.jtk-draggable.jtk-endpoint-anchor.jtk-connected, sourceId: "nodeB", targetId: "nodeC", …}
avue.js:8720 beforeDrop {sourceId: "nodeA", targetId: "nodeB", scope: "jsPlumb_DefaultScope", connection: b.Connection, dropEndpoint: b.Endpoint, …}
// 报错日志
jsplumb.min.js:2 cannot check condition [beforeDrop]TypeError: Cannot read property 'lineList' of undefined

avue.js:8680 connection {connection: b.Connection, source: div#nodeA.jtk-droppable.jtk-managed.jtk-draggable.jtk-endpoint-anchor.jtk-connected, target: div#nodeC.jtk-droppable.jtk-managed.jtk-draggable.jtk-dragged.jtk-endpoint-anchor.jtk-connected, sourceId: "nodeA", targetId: "nodeB", …}connection: b.Connection {id: "con_21", connector: b.C…s.<…>.<computed>, idPrefix: "_jsplumb_c_", defaultLabelLocation: 0.5, defaultOverlayKeys: Array(2), …}source: div#nodeA.jtk-droppable.jtk-managed.jtk-draggable.jtk-endpoint-anchor.jtk-connectedsourceEndpoint: b.Endpoint {idPrefix: "_jsplumb_e_", defaultLabelLocation: Array(2), defaultOverlayKeys: Array(2), _listeners: {…}, eventsSuspended: false, …}sourceId: "nodeA"target: div#nodeC.jtk-droppable.jtk-managed.jtk-draggable.jtk-dragged.jtk-endpoint-anchor.jtk-connectedtargetEndpoint: b.Endpoint {idPrefix: "_jsplumb_e_", defaultLabelLocation: Array(2), defaultOverlayKeys: Array(2), _listeners: {…}, eventsSuspended: false, …}targetId: "nodeB"__proto__: Object
```

###  **异常截图和代码**
 
连线关系异常，如下图：
![流程连线异常](https://images.gitee.com/uploads/images/2020/0527/163007_fd9a2f9b_7611955.png "屏幕截图.png")

GVP smallwei/Avue

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GVPsmallwei/Avue

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