Added check for empty description to nbis_events_scraper.
Added check for empty description to nbis_events_scraper.

ElixirUK/TeSS_scrapers,ElixirUK/newtessscraper,ElixirUK/TeSS_scrapers,ElixirUK/newtessscraper,ElixirUK/TeSS_scrapers,ElixirUK/newtessscraper