Validate sanity of grader_flags: ignore_sample
Validate sanity of grader_flags: ignore_sample

Kattis/problemtools,jsannemo/problemtools,ghamerly/problemtools,Kattis/problemtools,ghamerly/problemtools,ghamerly/problemtools,ghamerly/problemtools,jsannemo/problemtools,jsannemo/problemtools,Kattis/problemtools,jsannemo/problemtools,Kattis/problemtools