CppunitTest_libreofficekit_tiledrendering: add postUnoCommand() testcase
CppunitTest_libreofficekit_tiledrendering: add postUnoCommand() testcase

This fails without commit d4a12421f2b0aafe97f8ab78017261969c36ae0e
(desktop: pJSON may be 0 in jsonToPropertyValues(), 2015-04-29).

Change-Id: I08fffe65eb6cdc94fcfc57c2b8f1ec9fa546f70d

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