tdf#92982 vcl rendercontext: fix buffer size with empty user profile
tdf#92982 vcl rendercontext: fix buffer size with empty user profile

I did not notice this before, as my user profile had a custom window
size; but with an empty user profile the buffer had a 0,0 size, so the
buffered result was empty, as no ImplHandleResize() was invoked.

Change-Id: Ie299ad1323944941afc407dc90f2459d72885d42

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