set defaults for unset variables, trim trailing spaces

Dmitry Verkhoturov

20.10.2018 e9c7cc5c2fdc70603571516137d85bfaefbd4390

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{{ if .Site.Params.content.bio }}
<div class="split-bio">
  <p>{{ .Site.Params.content.bio | markdownify }}</p>
</div>
{{ end }}