Float division by zero on vertical resize

When squishing the video frame inwards, one border is able to meet the other causing a zero division error. Doesn't happen on horizontal resize as the frames smallest vertical size is 1 pixel.

  File "./mlrawviewer/GLCompute.py", line 227, in __draw
    self.onDraw(w,h)
  File "./mlrawviewer.py", line 238, in onDraw
    self.renderScenes()
  File "./mlrawviewer/GLCompute.py", line 213, in renderScenes
    s.render(self._frames)
  File "./mlrawviewer/GLCompute.py", line 171, in render
    self.prepareToRender()
  File "./mlrawviewer.py", line 169, in prepareToRender
    m2.viewport(width,height)
  File "./mlrawviewer/Matrix.py", line 21, in viewport
    self.m[1,1] *= float(width)/float(height)
ZeroDivisionError: float division by zero

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