Hopefully fix righhtpanel crash
Hopefully fix righhtpanel crash

The right panel wearns many hats, and only one of those hats comes
with a room prop, so make sure it's there.

matrix-org/matrix-react-sdk,matrix-org/matrix-react-sdk,matrix-org/matrix-react-sdk,matrix-org/matrix-react-sdk,matrix-org/matrix-react-sdk,matrix-org/matrix-react-sdk