Handle PATH not being set (fixes #336).
Handle PATH not being set (fixes #336).

mpetroff/pannellum,psteph801/psteph801.github.io,mpetroff/pannellum,mpetroff/pannellum,psteph801/psteph801.github.io,mpetroff/pannellum,psteph801/psteph801.github.io,psteph801/psteph801.github.io