Hi,

I cannot export graphs to svg files with graph_draw(). Exporting to pdf or png works fine.
With svg, it raises an ExpatError:

  File "/home/alex/graphtoolenv/lib/python3.6/site-packages/graph_tool/draw/cairo_draw.py", line 1197, in graph_draw
    img = IPython.display.SVG(data=out.getvalue())

  File "/home/alex/graphtoolenv/lib/python3.6/site-packages/IPython/core/display.py", line 599, in __init__
    self.data = data

  File "/home/alex/graphtoolenv/lib/python3.6/site-packages/IPython/core/display.py", line 717, in data
    x = minidom.parseString(svg)

  File "/usr/lib64/python3.6/xml/dom/minidom.py", line 1968, in parseString
    return expatbuilder.parseString(string)

  File "/usr/lib64/python3.6/xml/dom/expatbuilder.py", line 925, in parseString
    return builder.parseString(string)

  File "/usr/lib64/python3.6/xml/dom/expatbuilder.py", line 223, in parseString
    parser.Parse(string, True)

ExpatError: no element found: line 1, column 0


Any idea of the reason why it fails?

My graph-tool version is ''2.26 (commit b89e6b4e, Thu Nov 9 14:55:43 2017 +0000)'' manually compiled with Python3.6 on arch linux with "core/expat 2.2.5-1" and "multilib/lib32-expat 2.2.2-1".

Thanks

Regards,
Alex