make it work

src/client.js

@@ -418,6 +418,17 @@ MatrixClient.prototype.setGlobalBlacklistUnverifiedDevices = function(value) {
     this._crypto.setGlobalBlacklistUnverifiedDevices(value);
 };
 
+/**
+ * @return {boolean} whether to unilaterally blacklist all
+ * unverified devices
+ */
+MatrixClient.prototype.getGlobalBlacklistUnverifiedDevices = function() {
+    if (this._crypto === null) {
+        throw new Error("End-to-end encryption disabled");
+    }
+    return this._crypto.getGlobalBlacklistUnverifiedDevices();
+};
+
 /**
  * Get e2e information on the device that sent an event
  *

src/crypto/algorithms/megolm.js

@@ -475,7 +475,8 @@ MegolmEncryption.prototype._getDevicesInRoom = function(room) {
     //
     // XXX: what if the cache is stale, and the user left the room we had in common
     // and then added new devices before joining this one? --Matthew
-    return this._crypto.downloadKeys(roomMembers, false).then(function(devices) {
+    var self = this;
+    return self._crypto.downloadKeys(roomMembers, false).then(function(devices) {
         // remove any blocked (aka blacklisted) devices
         for (const userId in devices) {
             if (!devices.hasOwnProperty(userId)) {
@@ -491,7 +492,7 @@ MegolmEncryption.prototype._getDevicesInRoom = function(room) {
                 if (userDevices[deviceId].isBlocked() ||
                     (userDevices[deviceId].isUnverified() &&
                      (room.getBlacklistUnverifiedDevices() ||
-                      this._crypto.getGlobalBlacklistUnverifiedDevices())))
+                      self._crypto.getGlobalBlacklistUnverifiedDevices())))
                 {
                     delete userDevices[deviceId];
                 }