Add validator for award-emoji note

app/models/note.rb

@@ -41,6 +41,7 @@ class Note < ActiveRecord::Base
 
   validates :note, :project, presence: true
   validates :note, uniqueness: { scope: [:author, :noteable_type, :noteable_id] }, if: ->(n) { n.is_award }
+  validates :note, format: { with: /\A[-_+[:alnum:]]*\z/ }, if: -> (n){ n.is_award }
   validates :line_code, format: { with: /\A[a-z0-9]+_\d+_\d+\Z/ }, allow_blank: true
   # Attachments are deprecated and are handled by Markdown uploader
   validates :attachment, file_size: { maximum: :max_attachment_size }