Merge branch 'soru/key-request-try-catch' into 'master'

put key request in try...catch

See merge request famedly/famedlysdk!404

lib/encryption/key_manager.dart

@@ -417,6 +417,7 @@ class KeyManager {
         return; // we managed to load the session from online backup, no need to care about it now
       }
     }
+    try {
       // while we just send the to-device event to '*', we still need to save the
       // devices themself to know where to send the cancel to after receiving a reply
       final devices = await room.getUserDeviceKeys();
@@ -445,6 +446,10 @@ class KeyManager {
           encrypted: false,
           toUsers: await room.requestParticipants());
       outgoingShareRequests[request.requestId] = request;
+    } catch (err) {
+      print('[Key Manager] Sending key verification request failed: ' +
+          err.toString());
+    }
   }
 
   /// Handle an incoming to_device event that is related to key sharing