lib/asciidoctor/block.rb in asciidoctor-2.0.18 vs lib/asciidoctor/block.rb in asciidoctor-2.0.19

@@ -114,10 +114,10 @@
     when :verbatim, :raw
       # QUESTION could we use strip here instead of popping empty lines?
       # maybe apply_subs can know how to strip whitespace?
       result = apply_subs @lines, @subs
       if result.size < 2
-        result[0]
+        result[0] || ''
       else
         result.shift while (first = result[0]) && first.rstrip.empty?
         result.pop while (last = result[-1]) && last.rstrip.empty?
         result.join LF
       end