Polish Details Copy

Author: jzheaux

core/src/main/java/org/springframework/security/authentication/ProviderManager.java

@@ -278,7 +278,13 @@ private void prepareException(AuthenticationException ex, Authentication auth) {
 	 * @param dest the destination authentication object
 	 */
 	private Authentication copyDetails(Authentication source, Authentication dest) {
-		return (dest.getDetails() != null) ? dest : dest.toBuilder().details(source.getDetails()).build();
+		if (source.getDetails() == null) {
+			return dest;
+		}
+		if (dest.getDetails() != null) {
+			return dest;
+		}
+		return dest.toBuilder().details(source.getDetails()).build();
 	}
 
 	public List<AuthenticationProvider> getProviders() {