Make missing description URLs invisible

Make missing description URLs invisible in the dataset card.

README.md

@@ -375,10 +375,10 @@ configs:
 ## Dataset Description
 
 - **Homepage:** https://opus.nlpl.eu/legacy/UN.php
-- **Repository:**
+- **Repository:** [More Information Needed]
 - **Paper:** https://www.researchgate.net/publication/228579662_United_nations_general_assembly_resolutions_A_six-language_parallel_corpus
-- **Leaderboard:**
-- **Point of Contact:**
+- **Leaderboard:** [More Information Needed]
+- **Point of Contact:** [More Information Needed]
 
 ### Dataset Summary
 This is a collection of translated documents from the United Nations originally compiled into a translation memory by Alexandre Rafalovitch, Robert Dale (see http://uncorpora.org).