uwsgitop: don't call .endwin() before cursed has been initialized
uwsgitop: don't call .endwin() before cursed has been initialized

Fix this traceback when calling uwsgitop without parameters.

Error in sys.excepthook:
Traceback (most recent call last):
  File "uwsgitop", line 24, in exc_hook
    curses.endwin()
_curses.error: must call initscr() first

Jajcus/uwsgitop,ushuz/uwsgimon,unbit/uwsgitop,xrmx/uwsgitop,iiSeymour/uwsgitop