invalid attribute: stroke-width should not be 'NaN'

[chrisgarrity]

Some sprites' svgs get exported with stroke-width="NaN". This is not a valid attribute and causes errors when the svg is imported to other systems (Android).

When this is fixed file an issue on scratch-android to remove the work-around.

[BryceLTaylor]

This is related to these issues:
#32
#33

There are workaround for Android that strip each of these properties out of svgs that are a processing burden. According to @chrisgarrity, "There are now 4 work-arounds that require reading every svg file 4 times and making substitutions as needed."