Add Austrian district data to knowledge_graph.csv and clean up file. (#357)
Add Austrian district data to knowledge_graph.csv and clean up file. (#357)

* Sort knowledge_graph.csv and add missing commas.

* Add Austrian district data to knowledge_graph.csv

* Update datacommons for Austrian districts to use NUTS codes.

* Remove NA from datacommons codes.
GoogleCloudPlatform/covid-19-open-data,GoogleCloudPlatform/covid-19-open-data