jscript: Return NaN in Math.ceil if called without any argument.

dlls/jscript/math.c

@@ -174,8 +174,9 @@ static HRESULT Math_ceil(DispatchEx *dispex, LCID lcid, WORD flags, DISPPARAMS *
     TRACE("\n");
 
     if(!arg_cnt(dp)) {
-        FIXME("arg_cnt = 0\n");
-        return E_NOTIMPL;
+        if(retv)
+            num_set_nan(retv);
+        return S_OK;
     }
 
     hres = to_number(dispex->ctx, get_arg(dp, 0), ei, &v);

dlls/jscript/tests/api.js

@@ -431,6 +431,9 @@ ok(tmp === 1, "Math.ceil(true) = " + tmp);
 tmp = Math.ceil(1.1, 3, 4);
 ok(tmp === 2, "Math.ceil(1.1, 3, 4) = " + tmp);
 
+tmp = Math.ceil();
+ok(isNaN(tmp), "ceil() is not NaN");
+
 tmp = Math.floor(0.5);
 ok(tmp === 0, "Math.floor(0.5) = " + tmp);