Encounter with complex obs throws NullPointerException on save

When encounter with complex obs is added with new obs, it throws NullPointerException at https://github.com/openmrs/openmrs-core/blob/master/api/src/main/java/org/openmrs/api/impl/ObsServiceImpl.java#L222 . This happens because complex data is not loaded by default for complex obs but the check happens obs.getComplexData().getData()