fix(core): richgroup is not supported

* 'RichGroup is not supported' error when getting rich group data from database

(cherry picked from commit 3089fba)

Author: mattjoke

perun-rpc/src/main/java/cz/metacentrum/perun/rpc/ApiCaller.java

@@ -568,6 +568,7 @@ public List<PerunBean> fetchPerunBeans(List<PerunBean> objects) throws PerunExce
 	private PerunBean getBeanFromDatabase(PerunBean object) throws PerunException {
 		switch(object.getBeanName()) {
 			case "Group":
+			case "RichGroup":
 				return getGroupById(object.getId());
 			case "Vo":
 				return getVoById(object.getId());