#640 Remove force unwrap in SVGParser.doubleFromString method

[vox-humana]

There are two other possible fixes:

1. Add "null" string to this check in the beginning of SVGParser.doubleFromString method

if string == "none" {
   return 0
}

2. Make SVGParserRegexHelper.unitsIdenitifierPattern regexp stricter

However, I decided to go with the least destructive fix because tbh I don't know enough about SVG standard.

[amarunko]

Hi, @vox-humana, can you attach svg example where force unwrap calls crash or any other issues?

[vox-humana]

Hi @amarunko. I did it in the ticket #640. SVG Edit creates polygon with “null” attributes 🤦‍♂️

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[vox-humana]

Here is a file from SVG Edit
svg-edit-polygon.svg.zip

[amarunko]

sorry, I missed the issue, will look into

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[vox-humana]

Thank you @amarunko for the quick response here! /me switching our branch to master

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