jim.c: Allow Jim_WrongNumArgs() to accept NULL for msg

For consistency with Tcl

Reported-by: Stuart Cassoff <stwo@bell.net>
Signed-off-by: Steve Bennett <steveb@workware.net.au>

1 files changed, 1 insertions, 1 deletions

diff --git a/jim.c b/jim.c
index 752f014..2d16e55 100644
--- a/jim.c
+++ b/jim.c
@@ -11181,7 +11181,7 @@ void Jim_WrongNumArgs(Jim_Interp *interp, int argc, Jim_Obj *const *argv, const
 
     listObjPtr = Jim_NewListObj(interp, argv, argc);
 
-    if (*msg) {
+    if (msg && *msg) {
         Jim_ListAppendElement(interp, listObjPtr, Jim_NewStringObj(interp, msg, -1));
     }
     Jim_IncrRefCount(listObjPtr);