fix test failure

src/test/app/MPToken_test.cpp

@@ -571,7 +571,8 @@ class MPToken_test : public beast::unit_test::suite
                  .err = temINVALID_FLAG});
 
             if (!features[featureSingleAssetVault] &&
-                !features[featureDynamicMPT])
+                !features[featureDynamicMPT] &&
+                !features[featureConfidentialTransfer])
             {
                 // test invalid flags - nothing is being changed
                 mptAlice.set(

src/test/jtx/impl/mpt.cpp

@@ -18,6 +18,7 @@ ripple::Buffer
 generatePlaceholderCiphertext()
 {
     Buffer buf(ecGamalEncryptedTotalLength);
+    std::memset(buf.data(), 0, ecGamalEncryptedTotalLength);
 
     buf.data()[0] = 0x02;
     buf.data()[ecGamalEncryptedLength] = 0x02;