small improvements regarding pin tests and logging

OpenKeychain/src/main/java/org/sufficientlysecure/keychain/pgp/PgpKeyOperation.java

@@ -921,6 +921,9 @@ public class PgpKeyOperation {
 
             // if there is any old packet with notation data
             if (hasNotationData(sKR)) {
+
+                log.add(LogType.MSG_MF_NOTATION_EMPTY, indent);
+
                 // add packet with EMPTY notation data (updates old one, but will be stripped later)
                 PGPContentSignerBuilder signerBuilder = new JcaPGPContentSignerBuilder(
                         masterPrivateKey.getPublicKeyPacket().getAlgorithm(), HashAlgorithmTags.SHA512)
@@ -945,6 +948,8 @@ public class PgpKeyOperation {
         if (newUnlock.mNewPin != null) {
             sKR = applyNewPassphrase(sKR, masterPublicKey, passphrase, newUnlock.mNewPin, log, indent);
 
+            log.add(LogType.MSG_MF_NOTATION_PIN, indent);
+
             // add packet with "pin" notation data
             PGPContentSignerBuilder signerBuilder = new JcaPGPContentSignerBuilder(
                     masterPrivateKey.getPublicKeyPacket().getAlgorithm(), HashAlgorithmTags.SHA512)