Merge pull request #6296 from matrix-org/t3chguy/fix/17853

Prevent RoomDirectory from exploding when filterString is wrongly nulled

Author: t3chguy

src/components/structures/RoomDirectory.tsx

@@ -370,7 +370,7 @@ export default class RoomDirectory extends React.Component<IProps, IState> {
 
  private onFilterChange = (alias: string) => {
  this.setState({
- filterString: alias || null,
+ filterString: alias || "",
  });
 
  // don't send the request for a little bit,
@@ -389,7 +389,7 @@ export default class RoomDirectory extends React.Component<IProps, IState> {
  private onFilterClear = () => {
  // update immediately
  this.setState({
- filterString: null,
+ filterString: "",
  }, this.refreshRoomList);
 
  if (this.filterTimeout) {