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Conditionally joins a set of CSS class names into a single string

@param css_map [Hash] a mapping of CSS class names to boolean values
@return [String] a combined string of CSS classes where the value was true
@example Create a css string from a complex object
    hidden: article.has_chart?,
    [:foo, :bar] => false,
    [:foobar] => true
  => "base carl-the-fog foobar"

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