[NUI.Gadget] Fix static analysis issue (#4968)

Checker:
 - DEREF_OF_NULL

Signed-off-by: Hwankyu Jhun <h.jhun@samsung.com>

diff --git a/src/Tizen.NUI.Gadget/Tizen.NUI/NUIGadgetManager.cs b/src/Tizen.NUI.Gadget/Tizen.NUI/NUIGadgetManager.cs
index 0220ebd..fda5e27 100755 (executable)
--- a/src/Tizen.NUI.Gadget/Tizen.NUI/NUIGadgetManager.cs
+++ b/src/Tizen.NUI.Gadget/Tizen.NUI/NUIGadgetManager.cs
@@ -50,7 +50,10 @@ namespace Tizen.NUI
                     foreach (string packageId in packages.Split(':').ToList())
                     {
                         NUIGadgetInfo info = NUIGadgetInfo.CreateNUIGadgetInfo(packageId);
-                        _gadgetInfos.Add(info.ResourceType, info);
+                        if (info != null)
+                        {
+                            _gadgetInfos.Add(info.ResourceType, info);
+                        }
                     }
                 }
             }