Fix overlapping timestamps on empty messages (#8205)
Fix overlapping timestamps on empty messages (#8205)

* added min-height for event line

* Requested changes done

* Changes done

* fixing failing tests
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