epub.rb in softcover-0.6.4

- old
+ new

@@ -85,11 +85,11 @@
             doc = strip_attributes(Nokogiri::HTML(content))
             inner_html = doc.at_css('body').children.to_xhtml
             if math?(inner_html)
               html = html_with_math(chapter, images_dir, texmath_dir, pngs,
                                     options)
-              next if html.nil?
+              html ||= inner_html # handle case of spurious math detection
             else
               html = inner_html
             end
             f.write(chapter_template("Chapter #{i}", html))
           end
@@ -122,11 +122,16 @@
         # It shouldn't ever happen, but it does no harm to skip it.
         return nil unless File.exist?('phantomjs_source.html')
         raw_source = File.read('phantomjs_source.html')
         source = strip_attributes(Nokogiri::HTML(raw_source))
         rm 'phantomjs_source.html'
-        # Remove the first body div, which is the hidden MathJax SVGs
-        source.at_css('body div').remove
+        # Remove the first body div, which is the hidden MathJax SVGs.
+        if (mathjax_svgs = source.at_css('body div'))
+          mathjax_svgs.remove
+        else
+          # There's not actually any math, so return nil.
+          return nil
+        end
         # Remove all the unneeded raw TeX displays.
         source.css('script').each(&:remove)
         # Remove all the MathJax preview spans.
         source.css('MathJax_Preview').each(&:remove)
 
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