Comment 3 for bug 925635

I can re-create this problem with data we have.. if I set a graph to the last 6 hours.. it is fine.. anything more then that I get the

Traceback (most recent call last):
  File "/usr/lib/python2.6/site-packages/django/core/handlers/base.py", line 100, in get_response
    response = callback(request, *callback_args, **callback_kwargs)
  File "/opt/graphite/webapp/graphite/render/views.py", line 166, in renderView
    image = doImageRender(requestOptions['graphClass'], graphOptions)
  File "/opt/graphite/webapp/graphite/render/views.py", line 338, in doImageRender
    img = graphClass(**graphOptions)
  File "/opt/graphite/webapp/graphite/render/glyph.py", line 174, in __init__
    self.drawGraph(**params)
  File "/opt/graphite/webapp/graphite/render/glyph.py", line 515, in drawGraph
    self.setupYAxis()
  File "/opt/graphite/webapp/graphite/render/glyph.py", line 824, in setupYAxis
    raise GraphError('Logarithmic scale specified with a dataset with a '
GraphError: Logarithmic scale specified with a dataset with a minimum value less than or equal to zero