Add TryExec to the recently added desktop files.

menu/applications/Ri-li.desktop

@@ -5,6 +5,7 @@ Name=Ri-li
 GenericName=Ri-li
 Comment=Drive a toy wood engine
 Exec=Ri_li
+TryExec=Ri_li
 Icon=Ri-li
 Terminal=false
 StartupNotify=false

menu/applications/glchess.desktop

@@ -177,6 +177,7 @@ Keywords[zh_HK]=game;strategy;遊戲;策略;
 Keywords[zh_TW]=game;strategy;遊戲;策略;
 Version=1.0
 Exec=gnome-chess
+TryExec=gnome-chess
 Terminal=false
 Type=Application
 Categories=GNOME;Game;BoardGame;

menu/applications/stardict.desktop

@@ -49,6 +49,7 @@ Comment[vi]=Tra từ
 Comment[zh_CN]=查询单词
 Comment[zh_TW]=查詢單字
 Exec=stardict
+TryExec=stardict
 Terminal=false
 Type=Application
 Icon=stardict