It has to pe populated. The crystal is not present on the board. However, there is no such component, RTC in PSoC Designer. There is only a software library, and I was not able to find its documentation. Do you know anything about that?
Mine is an old one (5 years) and it had the 32kHz crystal on it. Nonetheless, there is a bill of materials showing what is needed.
There is no RTC component for PSoC1, but you may adopt the sources from PSoC4 or PSoC5 components (Take care, they are different)