Missing information in graphical projection of a composite block

From mbeddr.core created by [krishnanm86](https://github.com/krishnanm86) : mbeddr/mbeddr.core#1877

Starting Point
The user creates an incomplete connection in the textual view. This is a point of inconsistency visible to the user in textual projection.

User Action
The user now switches to graphical view.

Result
This user now doesn't see any inconsistency! Though this information is still there, also in the visualization.

Expected Result
Multiple folds:
Graphical projection should be as much as of a lossless projection of the textual/other projections. Units/conversions are pending and need separate issues to address and are beyond the scope of this issue.


Reproduce the incomplete connection in the textual view, then switch to the graphical view and compare what is displayed. Done means the graphical projection preserves the inconsistency; units and conversions remain out of scope.

Written by the indexing model from the issue text.