Revert "migrate some material files to nullsafety (#67078)" (#67183)
This reverts commit 81439922626f955a532c02180491bc7f3524baf2.
M
Michael Goderbauer committed
a0a65fc60442285b99d179ce7923430d129819a4
Parent: cbf1e13
Committed by GitHub <noreply@github.com>
on 10/3/2020, 11:54:45 AM