BasicTree 的几个bug

[zuihou]

BasicTree 设置blockNode=false后，显示异常，如图：

[zuihou]

合并了 #567 后， 还有如下样式问题：

    <BasicTree
      title="部门列表"
      toolbar
      checkable
      :blockNode="false"
      search
      :actionList="actionList"
      :beforeRightClick="getRightMenuList"
      :clickRowToExpand="true"
      :treeData="treeData"
      :replaceFields="{ key: 'id', title: 'label' }"
      @select="handleSelect"
      ref="treeRef"
    />

[zuihou]

[zuihou]

问题3：

[xiaoxian521]

哥们 你是真细节

[M69W]

看来要考虑很多场景

[anncwb]

这个细节没仔细处理，得在优化下

[anncwb]

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