So we ensure we send the actual revision ID, not potentially undefined, to the
method. If we send undefined, it'll give us an etag for revision number 0...
And that will cause issues when we later attempt (in a future editor switch) to
pass an etag for revision 0 along with the correct revision.
Bug: T143920
Change-Id: I0c27956abdd26ae4f5f1b91010a5eab8ee0354ab
Pretty much fix everything on the insert menu... RB doesn't like it when you
try to specify both title and revision ID, but don't provide an ETag.
Change-Id: Ib25d023309d984ed8848f67b349b23231f27a957