Skip empty entries from sys.path, log a debug message.
Skip empty entries from sys.path, log a debug message.

StackStorm/st2,nzlosh/st2,nzlosh/st2,tonybaloney/st2,tonybaloney/st2,nzlosh/st2,StackStorm/st2,Plexxi/st2,StackStorm/st2,tonybaloney/st2,Plexxi/st2,Plexxi/st2,Plexxi/st2,nzlosh/st2,StackStorm/st2