fix: minor stuff

lib/encryption/utils/key_verification.dart

@@ -643,11 +643,13 @@ class KeyVerification {
                 .map((device) => device.deviceId)
                 .toList()
                 .contains(key));
-            await client.sendToDeviceEncrypted(
-              deviceKeys!.values.toList(),
-              type,
-              payload,
-            );
+            if (deviceKeys != null && deviceKeys.isNotEmpty) {
+              await client.sendToDeviceEncrypted(
+                deviceKeys.values.toList(),
+                type,
+                payload,
+              );
+            }
           }
         } else {
           Logs().e(

lib/src/utils/device_keys_list.dart

@@ -225,7 +225,7 @@ abstract class SignableKey extends MatrixSignableKey {
     Set<String>? onlyValidateUserIds,
 
     /// Only check if this key is verified by any Master key.
-    bool verifiedByAnyMasterKey = false,
+    bool verifiedByTheirMasterKey = false,
   }) {
     if (!client.encryptionEnabled) {
       return false;
@@ -307,16 +307,16 @@ abstract class SignableKey extends MatrixSignableKey {
         if ((verifiedOnly && key.directVerified) ||
             (key is CrossSigningKey &&
                 key.usage.contains('master') &&
-                (verifiedByAnyMasterKey ||
+                (verifiedByTheirMasterKey ||
                     (key.directVerified && key.userId == client.userID)))) {
           return true; // we verified this key and it is valid...all checks out!
         }
-        // or else we just recurse into that key and chack if it works out
+        // or else we just recurse into that key and check if it works out
         final haveChain = key.hasValidSignatureChain(
             verifiedOnly: verifiedOnly,
             visited: visited_,
             onlyValidateUserIds: onlyValidateUserIds,
-            verifiedByAnyMasterKey: verifiedByAnyMasterKey);
+            verifiedByTheirMasterKey: verifiedByTheirMasterKey);
         if (haveChain) {
           return true;
         }