message: Wrap canEncryptToAllUsers in a try/catch to handle server errors
  Fixes
diff: @@ -275,12 +275,17 @@ export async function _waitForMember(client: MatrixClient, roomId: string, userI
  * can encrypt to.
  */
  export async function canEncryptToAllUsers(client: MatrixClient, userIds: string[]) {
  + try {
  const usersDeviceMap = await client.downloadKeys(userIds);
  // { "@user:host": { "DEVICE": {...}, ... }, ... }
  return Object.values(usersDeviceMap).every((userDevices) =>
  // { "DEVICE": {...}, ... }
  Object.keys(userDevices).length > 0,
  );
  + } catch (e) {
  + console.error("Error determining if it's possible to encrypt to all users: ", e);
  + return false; // assume not
  + }
  }
  export async function ensureDMExists(client: MatrixClient, userId: string): Promise<string> {
  