Clean up

app/src/components/Tree/TreeNodeSubnodes.tsx

@@ -1,7 +1,7 @@
 import * as React from 'react'
 import * as q from '../../../../backend/src/Model'
 import { withTheme, Theme } from '@material-ui/core/styles'
-import { List, ListItem, Collapse } from '@material-ui/core'
+
 import TreeNode from './TreeNode'
 
 export interface Props {
@@ -21,10 +21,6 @@ class TreeNodeSubnodes extends React.Component<Props, {}> {
       padding: '3px 8px 0px 8px',
     }
 
-    const listStyle = {
-      padding: '3px 8px 0px 8px',
-    }
-
     if (edges.length > 0 && !this.props.collapsed) {
       const listItems = edges
         .map(edge => edge.target)