Replace empty `dashPattern` with [0, 0]

[Landschaft]

This should fix issue 188

[coveralls]

Pull Request Test Coverage Report for Build 1917100499

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.1%) to 77.778%

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Totals
Change from base Build 1864229336:	0.1%
Covered Lines:	475
Relevant Lines:	602

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💛 - Coveralls