avoid NPE on setMapRotation (fix #8937)
avoid NPE on setMapRotation (fix #8937)

matej116/cgeo,S-Bartfast/cgeo,tobiasge/cgeo,matej116/cgeo,cgeo/cgeo,tobiasge/cgeo,S-Bartfast/cgeo,rsudev/c-geo-opensource,auricgoldfinger/cgeo,auricgoldfinger/cgeo,matej116/cgeo,S-Bartfast/cgeo,rsudev/c-geo-opensource,rsudev/c-geo-opensource,cgeo/cgeo,cgeo/cgeo,tobiasge/cgeo,auricgoldfinger/cgeo,cgeo/cgeo