Armature Parent to Vertex Group - vertices with 0 bone weight get dropped

Hi,

[Disclaimer: I am now reporting a lot of bugs that i find playing with Armory. The intent is to help make it better. Let me know if this is helpful or not.]

The following set up:
Left and right side contain one mesh each (even though right side consists of two cubes - it's still one mesh).
On the **left side**, two vertices are parented to the bone. The bone is moved along Y in pose mode.
On the **right side**, one cube (disconnected mesh) is parented to the bone. The bones is moved along Y in pose mode.

**Issue 1: With no animation applied**
Armory does not show any displacement of the geometry.

**Issue 2: With animation applied on bone**
For connected mesh, armory shows nothing.
For disconnected mesh, armory shows only the parts that are parented to a bone (not-parented parts are not shown).

[Issue.zip](https://github.com/armory3d/armory/files/1439240/Issue.zip)

Open the attached Issue.zip in Blender and reproduce both reported cases: an armature-parented mesh without animation and one with bone animation. Trace the Armory Blender integration and skinning path from that reproduction; done means connected and disconnected meshes retain all vertices, including those with zero bone weight, and follow the bone as described.

Written by the indexing model from the issue text.