remove usage of hardcoded empty lists

[brucehyslop]

The biocache-service endpoints to retrieve:

• queryAssertions
• dynamicFacets

return hardcoded empty datasets.

Removed the the calls to these endpoints and the use to the data.

[sughics]

TODO - Test on a deployed instance

[sughics]

@brucehyslop - minor comment: Could we just remove the commented out code?