fix `nil` checks of strings and seqs

SciNim / nim-plotly

plotly wrapper for nim-lang

https://scinim.github.io/nim-plotly/

MIT License

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fix `nil` checks of strings and seqs #22

Closed Vindaar closed 6 years ago

Vindaar commented 6 years ago

Due to recent changes on Nim's devel, nil is not a valid value for strings and seqs anymore. This change replaces checks for nil by checks on the length of the string or seq.