Clean the json/csv and report when/why parsing fails

[Patechoc]

Data Cleansing after extraction

Many treaties once extracted show missing information, or not well parsed data. This work consists in finding some of those and try to fix them.

Definition of Done

• [x] Identification of missing fields and explanations written in this issue as comments.
• [x] Improved crawling when possible.

Next steps

• Data exploration & Visualization