gh classroom assignment-grades downloads invalid csv

[rlalik]

After calling gh classroom assignment-grades for a given assignment, my csv file have assigned grades equal to 0 for all students, despite that they have some other grade which I can see in the assignment view on classroom page.

E.g. my file contains:

,points_awarded,points_available
,0,4

while in the view I see 3.0000000000000004/4.