Image assets with whitespace in path are not rendered correctly

[johannesloibl]

Asset Script:

from pharaoh.assetlib.api import register_asset

register_asset("C:/temp/image with whitespace.png", metadata={"id": "myimage"})

Template:

.. pharaoh-asset:: id == "myimage"

This will fail with an error like this:

internal padding after C:\git\...\index.rst:6: WARNING: image file not readable: .asset_build/ImageGallery/imagewithwhitespace_bba7153e.png

After replacing the whitespace in the filename with _ everything works as expected.