メッセージ検索修正。

ABVJE_BL/src/jp/agentec/abook/abv/bl/data/dao/ChatMessageDao.java

@@ -124,6 +124,9 @@ public class ChatMessageDao extends AbstractDao {
 		sql.append(" WHERE cm.message_type = 0 ");
 		List<String> whereSqlList = new ArrayList<String>();
 		for (String keyword : keywords) {
+			if (StringUtil.isNullOrEmpty(keyword)) {
+				continue;
+			}
 			whereSqlList.add("cm.message LIKE  '%" + keyword + "%'");
 		}
 		String whereSql = StringUtil.join(" AND ", whereSqlList);