Don't call PasswordUtil when the algorithm is null

Author: coheigea

interceptors/hash/src/main/java/org/apache/directory/server/core/hash/ConfigurableHashingInterceptor.java

@@ -127,7 +127,7 @@ private void includeHashed( Attribute attribute ) throws LdapInvalidAttributeVal
             // check if the given field is already hashed
             LdapSecurityConstants existingAlgo = PasswordUtil.findAlgorithm( bytes );
 
-            if ( existingAlgo == null ) 
+            if ( existingAlgo == null && algorithm != null ) 
             {
                 // not already hashed, so hash it
                 values.add( PasswordUtil.createStoragePassword( bytes, algorithm ) );

interceptors/hash/src/main/java/org/apache/directory/server/core/hash/PasswordHashingInterceptor.java

@@ -161,7 +161,7 @@ private Attribute includeHashedPassword( Attribute pwdAt ) throws LdapException
             LdapSecurityConstants existingAlgo = PasswordUtil.findAlgorithm( userPassword.getBytes() );
 
             // if there exists NO algorithm, then hash the password
-            if ( existingAlgo == null )
+            if ( existingAlgo == null && algorithm != null )
             {
                 byte[] hashedPassword = PasswordUtil.createStoragePassword( userPassword.getBytes(), algorithm );