Merge branch '4875_발송_페이지_로딩_속도개선'

src/main/webapp/WEB-INF/jsp/web/msgdata/MsgDataSMLView.jsp

@@ -3617,6 +3617,9 @@ function getMjMsgSentListAll(pageNo) {
 				<div class="history_cont hascont">
 					<div class="histroy_trans" id="bookMarkMsgArea">
 						<ul id="bookMsgUl">
+									<li>
+										<p>데이터 로딩중입니다.</p>
+									</li>
 							<%-- <c:choose>
 								<c:when test="${not empty resultBookMarkMsgList}">
 									<c:forEach var="bookMarkMsgList" items="${resultBookMarkMsgList}" varStatus="status">