SSDM-5721: Improve code after review by Piotr

...1/as/webapps/openbis-v3-api-test/html/test/test-create.js

...1/as/webapps/openbis-v3-api-test/html/test/test-update.js

...server/asapi/v3/executor/person/CreatePersonExecutor.java

...ver/asapi/v3/executor/person/ISetPersonSpaceExecutor.java

...asapi/v3/executor/person/PersonAuthorizationExecutor.java

...server/asapi/v3/executor/person/SearchPersonExecutor.java

...rver/asapi/v3/executor/person/SetPersonSpaceExecutor.java

...server/asapi/v3/executor/person/UpdatePersonExecutor.java

...r/roleassignment/RoleAssignmentAuthorizationExecutor.java

...c/resources/api/v3/as/dto/person/create/PersonCreation.js

...lic/resources/api/v3/as/dto/person/update/PersonUpdate.js

...ch/ethz/sis/openbis/systemtest/asapi/v3/AbstractTest.java

...thz/sis/openbis/systemtest/asapi/v3/CreatePersonTest.java

...thz/sis/openbis/systemtest/asapi/v3/SearchPersonTest.java

...thz/sis/openbis/systemtest/asapi/v3/UpdatePersonTest.java

...is/generic/asapi/v3/dto/person/create/PersonCreation.java

...nbis/generic/asapi/v3/dto/person/update/PersonUpdate.java