fdo#59437: SwFmtAnchor::SetAnchor: Anchors may be on StartNodes
fdo#59437: SwFmtAnchor::SetAnchor: Anchors may be on StartNodes

Assertion added in 90a0116ccb48388d91b21128fcac2e4609838581 wasn't quite
right.

Change-Id: Icac6c4e3932837ffaf170d9b18664e5b4ff579ff

JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core