SQL文 nullcheck追加

ABVJE_BL/src/jp/agentec/abook/abv/bl/logic/CommunicationLogic.java

@@ -211,6 +211,10 @@ public class CommunicationLogic extends AbstractLogic {
 	}
 
 	public String getUserListByLoginId(String loginIdList) {
+		if (loginIdList == null) {
+			return null;
+		}
+
 		String[] userIdArray = loginIdList.split(",");
 		List<ShopMemberDto> shopMemberDtoList = shopMemberDao.getUserListByLoginId(userIdArray);
 		JSONArray joinedMemberArray = new JSONArray();