penguinolog / urwid / 7542682765 / 9

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LineBox: make side only if side elements present, fix pack

* BUG: `LineBox().pack` was ignored nonexistent top/bottom.
  Switch to the backend (Pile) `pack` usage to get proper size
* Semi-bug: in case of no side,
  empty elements was partially added (top and bottom)
  with fixed size == 1  (Bug #337)
* For consistency add right corner with width=0 if no right corner
* Propagate default empty size for `pack`
  if widgets are optionally FIXED
  No size will be handled internally

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