null-guard dataset mxTheme to prevent html exports from exploding (#7493)
null-guard dataset mxTheme to prevent html exports from exploding (#7493)


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