Don't crash if the value of a room tag is null
Don't crash if the value of a room tag is null

We were checking that the order was not null, but not the object
itself.

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