2021-February-28 - Prerelease - 2.6.52@f135811317

Fix resource loader not set error on hosted game chat (#8943)

This update restores the defaulting of a game-engine only asset loader
when there is no resource loader otherwise set.

Problem introduced in: f3face998ca1ee91eae5ffce1c7580fb9d0ebf0e,

Fixes: https://github.com/triplea-game/triplea/issues/8927