Don't throw in GetInnerText if there is no element style. e.g. for co…

[campersau]

…mments

Types of Changes

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• [X] Bug fix (non-breaking change which fixes an issue, please reference the issue id)
• [ ] New feature (non-breaking change which adds functionality, make sure to open an associated issue first)
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• [X] I have added tests to cover my changes
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Description

Two null checks for elementStyle were missing which would throw a NRE for e.g. comment nodes.

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