Handle null JdbcMappingHint in visitObjectWrapper method

Previously, a null JdbcMappingHint could cause a NullPointerException. This fix introduces a check to ensure a default JdbcType is used if the hint is null, preventing potential runtime errors.

Author: nakamura-to

doma-core/src/main/java/org/seasar/doma/jdbc/dialect/StandardDialect.java

@@ -578,7 +578,12 @@ public Void visitUtilDateWrapper(
     @Override
     public Void visitObjectWrapper(ObjectWrapper wrapper, JdbcMappingFunction p, JdbcMappingHint q)
         throws SQLException {
-      JdbcType<Object> jdbcType = q.getJdbcType().orElse(JdbcTypes.OBJECT);
+      JdbcType<Object> jdbcType;
+      if (q != null) {
+        jdbcType = q.getJdbcType().orElse(JdbcTypes.OBJECT);
+      } else {
+        jdbcType = JdbcTypes.OBJECT;
+      }
       return p.apply(wrapper, jdbcType);
     }
   }