Extract an imports partial.

doc-src/content/reference/blueprint.haml

@@ -6,11 +6,7 @@
   a single mixin, <code class="mixin">+blueprint</code>, that
   can be used to generate the blueprint css styles.
 
-%h2 Imports
-
-%ol
-  - imports(@item).each do |import|
-    %li= import
+= render "partials/reference/imports"
 
 %h2 Mixins
 

doc-src/layouts/partials/reference/imports.haml

@@ -0,0 +1,6 @@
+- if (imported_libs = imports(@item)).any?
+  %h2 Imports
+
+  %ol
+    - imported_libs.each do |import|
+      %li= import

doc-src/layouts/partials/reference/imports.yaml

@@ -0,0 +1 @@
+--- {}