Add PYTHONPATH to hadoop-env.sh during installation only if the variable is set
Add PYTHONPATH to hadoop-env.sh during installation only if the variable is set

simleo/pydoop,crs4/pydoop,ilveroluca/pydoop,crs4/pydoop,kikkomep/pydoop,kikkomep/pydoop,ilveroluca/pydoop,mdrio/pydoop,ilveroluca/pydoop,elzaggo/pydoop,ilveroluca/pydoop,crs4/pydoop,mdrio/pydoop,kikkomep/pydoop,mdrio/pydoop,elzaggo/pydoop,simleo/pydoop,ilveroluca/pydoop,kikkomep/pydoop,elzaggo/pydoop,mdrio/pydoop,elzaggo/pydoop,kikkomep/pydoop,mdrio/pydoop,simleo/pydoop,crs4/pydoop,elzaggo/pydoop,crs4/pydoop,simleo/pydoop,simleo/pydoop