Fix a bug.

client/src/components/Window.tsx

@@ -1,16 +1,20 @@
 import React, { useState, useEffect } from 'react';
-import { ThemeProvider, CssBaseline, createMuiTheme, AppBar, Box } from '@material-ui/core';
+import { ThemeProvider, CssBaseline, createMuiTheme, AppBar, Box, LinearProgress } from '@material-ui/core';
 import { QueryElem, toApiQuery } from '../lib/query/Query';
 import QueryBuilder from './querybuilder/QueryBuilder';
 import * as serverApi from '../api';
 import { SongTable } from './tables/ResultsTable';
 import stringifyList from '../lib/stringifyList';
 import { getArtists, getSongTitles, getAlbums, getTags } from '../lib/query/Getters';
+import { grey } from '@material-ui/core/colors';
 var _ = require('lodash');
 
 const darkTheme = createMuiTheme({
     palette: {
-        type: 'dark'
+        type: 'dark',
+        primary: {
+            main: grey[100],
+        }
     },
 });
 
@@ -114,6 +118,7 @@ export default function Window(props: any) {
                     songs={showResults}
                     songGetters={songGetters}
                 />
+                {loading && <LinearProgress />}
             </Box>
         </Box>
 

client/src/lib/query/Query.tsx

@@ -18,7 +18,7 @@ export interface TagQueryInfo {
     matchIds: number[],
 }
 export function isTagQueryInfo(e: any): e is TagQueryInfo {
-    return 'fullName' in e && 'matchIds' in e;
+    return (typeof e === 'object') && 'fullName' in e && 'matchIds' in e;
  }
 
 export type QueryLeafOperand = string | number | TagQueryInfo;