Luca Schirmbrand

Minimum Bounding Box appears to be not minimum

5

### Checklist - [X] I have searched for [similar issues](https://github.com/isl-org/Open3D/issues). - [X] For Python issues, I have tested with the [latest development wheel](http://www.open3d.org/docs/latest/getting_started.html#development-version-pip). - [X] I have checked the [release...

executed by the context menu.

Null Reference Exception on DesignItem

1

In RotateLeftAndRightContextMenu, Null Reference Exception when right-clicking outside the canvas, because the design item was null, but there was no check for is null.