Checking for the presense of markdown text

lib/markdown_utils.rb

@@ -3,6 +3,10 @@ class MarkdownUtils
 
   # Convert image urls in the markdown text to absolute urls
   def self.absolute_image_urls(markdown_text)
+    if markdown_text.present?
       markdown_text.gsub(/!\[(.*?)\]\((.*?)\)/, "![\\1](#{Settings.gitlab.url}\\2)")
+    else
+      markdown_text
+    end
   end
 end