Fix current_hours/total_hours inside the visualization

[CarryHof]

The issue #249 should either be fixed before this issue is tackled, or some sort of abstraction layer must be introduced.

[CarryHof]

Right now, the model handles blocked days same as vacation. Without this assumption, there may not be a valid solution in some cases.

To 100% fix this would need information from our industry partners on how to handle such faulty instances.