Chore: Evaluate Create Channel - TypeScript (#4144)

app/reducers/createChannel.ts

@@ -4,7 +4,7 @@ import { CREATE_CHANNEL } from '../actions/actionsTypes';
 interface ICreateChannelResult {
 	name: string;
 	users: string[];
-	teamId: string;
+	teamId?: string;
 	type: boolean;
 	readOnly: boolean;
 	encrypted: boolean;

app/views/CreateChannelView.tsx

@@ -224,7 +224,7 @@ class CreateChannelView extends React.Component<ICreateChannelViewProps, ICreate
 			broadcast,
 			encrypted,
 			isTeam,
-			teamId: this.teamId!
+			teamId: this.teamId
 		};
 		dispatch(createChannelRequest(data));
 		Review.pushPositiveEvent();