refactor: fix ripple-renderer in TS3.7 (#17927)
refactor: fix ripple-renderer in TS3.7 (#17927)

Another DOM style nullable issue.
Jefiozie/material2,Jefiozie/material2,andrewseguin/material2,crisbeto/material2,crisbeto/material2,crisbeto/material2,DevVersion/material2,josephperrott/material2,josephperrott/material2,josephperrott/material2,DevVersion/material2,josephperrott/material2,josephperrott/material2,angular/components,mmalerba/material2,Jefiozie/material2,mmalerba/material2,angular/components,andrewseguin/material2,mmalerba/material2,andrewseguin/material2,DevVersion/material2,angular/components,Jefiozie/material2,angular/components,DevVersion/material2,mmalerba/material2,Jefiozie/material2,andrewseguin/material2,andrewseguin/material2,mmalerba/material2,DevVersion/material2,crisbeto/material2