tdf#90946: sw: ODF import: ignore invalid gradient-name if style SOLID
tdf#90946: sw: ODF import: ignore invalid gradient-name if style SOLID

The bugdoc has a fill-gradient-name that refers to a non-existent
gradient and also draw:fill="solid"; handle this combination without
exception.

Change-Id: I2c912b28a6b1550e2e4c6c71ff8889ae1779c618

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