Conditionally hide the PDF link in comparison pages

README.md

@@ -369,7 +369,8 @@ Notes:
 - Although the file is named with GitLab being first, the title should have the
   competitor name first.
 - The `pdf` name should be similar to the yaml file name, but with dashes. In
-  short, it has to match the HTML page name in step 2.
+  short, it has to match the HTML page name in step 2. If you want to omit the
+  PDF link altogether, set its value to `null`, like: `pdf: 'null'`.
 - Remember to update the date every time you make a change.
 - The competitor's logo (`competitor_two`) can be `svg` or `png`. Save it in
   `source/images/comparison/competitor-logo.svg`.

source/includes/comparison_table.html.haml

@@ -82,7 +82,8 @@
   %p.clearfix
     Last updated:
     = comparison_block.last_updated
-    = link_to "Download as PDF", "/comparison/pdfs/#{comparison_block.pdf}", class: "featured-item-button pull-right", download: "Comparison PDF", target: "_blank"
+    - if (comparison_block.pdf != "null")
+      = link_to "Download as PDF", "/comparison/pdfs/#{comparison_block.pdf}", class: "featured-item-button pull-right", download: "Comparison PDF", target: "_blank"
   %p
     Since GitLab fans wrote most of the text here there is a pro-GitLab bias. Nonetheless we try hard to ensure the
     comparisons are fair and factual. Please also add things that are great in other products but missing in GitLab.