BUG: On side bar in Explorer view when clicking on a specific facet all microscopes disappear

[strambc]

On side bar in Explorer view when clicking on a specific facet all microscopes disappear

To reproduce:

1. Launch Micro-Meta Explorer
2. Open one of the Facets categories
3. Click on the Facet number

Before clicking on "Type/Inverted"

After clicking on "Type/Inverted"

[Akramhar]

This should be fixed in MME 1.1.0-b1