Missing empty "gen" dir

[pfalcon]

Immediately after checkout:

$ make
...
Outputting decision tree
Traceback (most recent call last):
  File "scripts/build_jswrapper.py", line 135, in <module>
Traceback (most recent call last):
  File "scripts/build_platform_config.py", line 90, in <module>
    wrapperFile = open('gen/jswrapper.c', 'w')
    IOErrorheaderFile = open(headerFilename, 'w')
: [Errno 2] No such file or directory: 'gen/jswrapper.c'IOError
: [Errno 2] No such file or directory: 'gen/platform_config.h'
make: *** [gen/platform_config.h] Error 1
make: *** Waiting for unfinished jobs....
make: *** [gen/jswrapper.c] Error 1

That's because there's missing "gen" folder, which is becasue git doesn't store empty dirs, and way to work that round is to add ".empty" or similar file.

[gfwilliams]

Thanks. just fixed.