Fix unexpected 'undefined' path
Fix unexpected 'undefined' path

Added missing checks of (optional and uninitialized) basePath attribute of config.multiRes. So default basePath/ tourConfig's basePath and multires basePath are the same if there is no explicit setting.

psteph801/psteph801.github.io,riuson/pannellum,Benvii/pannellum,quentinyang/pannellum,ywjrg/pannellum,psteph801/psteph801.github.io,mpetroff/pannellum,ywjrg/pannellum,ywjrg/pannellum,psteph801/psteph801.github.io,mpetroff/pannellum,riuson/pannellum,eric-seekas/pannellum,mpetroff/pannellum,psteph801/psteph801.github.io,eric-seekas/pannellum,mpetroff/pannellum,riuson/pannellum,eric-seekas/pannellum,quentinyang/pannellum,eric-seekas/pannellum,quentinyang/pannellum,quentinyang/pannellum,Benvii/pannellum,Benvii/pannellum,ywjrg/pannellum,riuson/pannellum,Benvii/pannellum