CurveFrame node with SvLambdaCurve break

Created by: summereasy

Problem statement

[Curve Frame node] won't work properly with [Curve Formula]

[ERROR] sverchok.utils.curve.core:128 : tangent_array() got an unexpected keyword argument 'tangent_delta'

Steps to reproduce

as shown here:

Environment STATUS

Software	Version
Blender	3.0
Sverchok	Latest
System	MacOS Monterey 12.1

I did a bit of search in code ...

FILE: utils/curve/core.py line 743

class SvLambdaCurve(SvCurve):
    ... 
    def tangent_array(self, ts):  # <--- this line
        points = np.vectorize(self.function, signature='()->(3)')(ts)
        points_h = np.vectorize(self.function, signature='()->(3)')(ts+self.tangent_delta)
        return (points_h - points) / self.tangent_delta

If I change it:

-    def tangent_array(self, ts): 
+    def tangent_array(self, ts, tangent_delta=None):

It will work fine. But I won't trust me myself to modify it since I am still learning from the code and don't know the whole picture of it. So I just post it here to see if this is a real bug or I just did something wrong.

Sverchok is great, Many Thanks!