HHH-13848 - Fix for potential NullPointerException

The callers of the convert() method in ResourceRegistryStandardImpl expect an exception which is then thrown. This me produce NullPointerException, which has been fixed in this commit.

hibernate-core/src/main/java/org/hibernate/resource/jdbc/internal/ResourceRegistryStandardImpl.java

@@ -245,8 +245,7 @@ public final class ResourceRegistryStandardImpl implements ResourceRegistry {
 	}
 
 	private JDBCException convert(SQLException e, String s) {
-		// todo : implement
-		return null;
+		return new JDBCException(s, e);
 	}
 
 	@Override