[+] InterfaceToConn foreign interface and NA check

Author: SolidProgramming

roles/ui/files/FWO.UI/Pages/NetworkModelling/EditConn.razor

@@ -489,7 +489,7 @@
     {
         if(Container.ConnElement != null)
         {
-            if (!ConnHandler.InterfaceAllowedWithNetworkArea(Container.ConnElement))
+            if (ConnHandler is not null && !ConnHandler.InterfaceAllowedWithNetworkArea(Container.ConnElement))
             {
                 DisplayMessageInUi(default, userConfig.GetText("edit_connection"), userConfig.GetText("foreign_interface_na"), true);
                 Container.Clear();
@@ -513,7 +513,7 @@
             }
             if(Container.AreaElements.Count > 0)
             {
-                if (!ConnHandler.InterfaceAllowedWithNetworkArea())
+                if (ConnHandler is not null && !ConnHandler.InterfaceAllowedWithNetworkArea())
                 {
                     DisplayMessageInUi(default, userConfig.GetText("edit_connection"), userConfig.GetText("foreign_interface_na"), true);
                     Container.Clear();
@@ -545,7 +545,7 @@
     {
         if(Container.ConnElement != null)
         {
-            if (!ConnHandler.InterfaceAllowedWithNetworkArea(Container.ConnElement))
+            if (ConnHandler is not null && !ConnHandler.InterfaceAllowedWithNetworkArea(Container.ConnElement))
             {
                 DisplayMessageInUi(default, userConfig.GetText("edit_connection"), userConfig.GetText("foreign_interface_na"), true);
                 Container.Clear();
@@ -569,7 +569,7 @@
             }
             if(Container.AreaElements.Count > 0)
             {
-                if (!ConnHandler.InterfaceAllowedWithNetworkArea())
+                if (ConnHandler is not null && !ConnHandler.InterfaceAllowedWithNetworkArea())
                 {
                     DisplayMessageInUi(default, userConfig.GetText("edit_connection"), userConfig.GetText("foreign_interface_na"), true);
                     Container.Clear();

roles/ui/files/FWO.UI/Pages/NetworkModelling/EditConnLeftSide.razor

@@ -298,6 +298,12 @@
 
     private bool InterfaceToConn(ModellingConnection interf)
     {
+        if (ConnHandler is not null && !ConnHandler.InterfaceAllowedWithNetworkArea(interf))
+        {
+            DisplayMessageInUi(default, userConfig.GetText("edit_connection"), userConfig.GetText("foreign_interface_na"), true);           
+            return false;
+        }
+
         ConnHandler?.InterfaceToConn(interf);
         ConnHandlerChanged.InvokeAsync(ConnHandler);
         return true;