Crash when the PAGER is less -R

[alexdong]

> echo $PAGER
less -R

Then if I use < or > to navigate, I will get the following exception.

› mitmproxy -nr game_subway-bmx

Traceback (most recent call last):
  File "/usr/local/bin/mitmproxy", line 67, in <module>
    m.run()
  File "/Library/Python/2.7/site-packages/libmproxy/console/__init__.py", line 583, in run
    self.ui.run_wrapper(self.loop)
  File "/Library/Python/2.7/site-packages/urwid/raw_display.py", line 242, in run_wrapper
    return fn()
  File "/Library/Python/2.7/site-packages/libmproxy/console/__init__.py", line 812, in loop
    k = self.view.keypress(size, k)
  File "/Library/Python/2.7/site-packages/urwid/container.py", line 1103, in keypress
    return self.body.keypress( (maxcol, remaining), key )
  File "/Library/Python/2.7/site-packages/libmproxy/console/flowview.py", line 546, in keypress
    self.master.spawn_external_viewer(conn.content, t)
  File "/Library/Python/2.7/site-packages/libmproxy/console/__init__.py", line 546, in spawn_external_viewer
    subprocess.call(cmd, shell=shell)
  File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/subprocess.py", line 493, in call
    return Popen(*popenargs, **kwargs).wait()
  File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/subprocess.py", line 679, in __init__
    errread, errwrite)
  File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/subprocess.py", line 1228, in _execute_child
    raise child_exception
OSError: [Errno 2] No such file or directory

[kanzure]

I bet this is because it's trying to call "less -R" instead of "less".