Add call for device opening

This should prevent errors <NOT OPEN> when the application is running
outside the CSP enviroment.

e.g. Using the Forgery lib.

Author: Rubens F. N. da Silva

cls/Frontier/Method.cls

@@ -438,7 +438,8 @@ Method Invoke(Output methodReturn = "", Output stack As %Stream.Object = "") As
   set io = $io
   merge methodArguments = ..Arguments
   set returnType = ..MethodDescriptor.ReturnType
-    
+  
+  open $$$NULL
   use $$$NULL
 
   new $estack
@@ -453,8 +454,9 @@ Method Invoke(Output methodReturn = "", Output stack As %Stream.Object = "") As
     do ##class(Frontier.Exception).CaptureStack(.stack)
     set sc = ex.AsStatus()
   }
-  
+    
   use io 
+  close $$$NULL
   return sc
 }