Don't enable e2ee from profileViewer for bridge users (#666)

src/util/matrixUtil.js

@@ -199,3 +199,16 @@ export function getSSKeyInfo(key) {
     return undefined;
   }
 }
+
+export async function hasDevices(userId) {
+  const mx = initMatrix.matrixClient;
+  try {
+    const usersDeviceMap = await mx.downloadKeys([userId, mx.getUserId()]);
+    return Object.values(usersDeviceMap).every((userDevices) =>
+      Object.keys(userDevices).length > 0,
+    );
+  } catch (e) {
+    console.error("Error determining if it's possible to encrypt to all users: ", e);
+    return false;
+  }
+}