Conform more of the code base to strict null checking (#10147)

* Conform more of the code base to strict null checking

* More strict fixes

* More strict work

* Fix missing optional type

* Iterate

src/components/views/dialogs/SetEmailDialog.tsx

@@ -138,7 +138,7 @@ export default class SetEmailDialog extends React.Component<IProps, IState> {
         );
     }
 
-    public render(): JSX.Element {
+    public render(): React.ReactNode {
         const emailInput = this.state.emailBusy ? (
             <Spinner />
         ) : (