DrawString:
The value 'fontAttribute' is optional and may be null,
results in missing characters.

DrawImage:
The case of 'metafile' was missing and leads to
low resolution rendering.

Change-Id: I81566d884975fda832f4a5af6663c837f355c383
Reviewed-on: https://gerrit.libreoffice.org/43367Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Bartosz Kosiorek <gang65@poczta.onet.pl>