Fix ResearchActivityService to convert empty RoleCode and ActivityTypeCode to null#305

sarkikos merged 1 commit intomasterCSCfi/research-fi-mydata:masterfrom

CSCTTV-4297-profile-data-optimization-fix-researchactivity-typeand-role-code-empty-valuesCSCfi/research-fi-mydata:CSCTTV-4297-profile-data-optimization-fix-researchactivity-typeand-role-code-empty-valuesCopy head branch name to clipboard