fix #11140: fix npe on opening cache link (#11143)
fix #11140: fix npe on opening cache link (#11143)


cgeo/cgeo,rsudev/c-geo-opensource,rsudev/c-geo-opensource,cgeo/cgeo,tobiasge/cgeo,rsudev/c-geo-opensource,tobiasge/cgeo,cgeo/cgeo,tobiasge/cgeo,cgeo/cgeo