Empty render scene in jupyter notebook

**Describe the bug**
In notebook:
```
data = PyntCloud.from_file(ply_path)
raw_cloud = data.plot(return_scene = True, backend="pythreejs")
```
It returns render scene filled with selected color (black is default).

Jupyter logs:
```
[W 16:07:57.148 NotebookApp] 404 GET /static/notebook/js/main.min.js.map (93.92.200.162) 2.42ms referer=None
```
In browser console:
```
Error: request failed with status 404
URL: http://server:port/static/notebook/js/main.min.js?v=68936091b7b2dafbb368b29294028b02
```
With backend="threejs" same problem, but no render scene is shown.

**Expected behavior**
Render scene with colored point cloud.

**Screenshots**

**Desktop (please complete the following information):**
- OS: client: Windows 10 , jupyter on Ubuntu 18.04
- Browser (if necessary) [chrome, firefox]
- Version (master branch commit)