Some sources don't get added 

Cassandra and MS SQL sources on the admin portal doesn't work. 
Attempting to add either of the two sources, even after adding the key/values manually, doesn't do anything. 
Browser console shows this error : 

![image](https://user-images.githubusercontent.com/10858008/165021810-e573b622-7e95-41a0-9617-82d3cb021a06.png)


