FIX: validate presence of 'top menu' setting

lib/validators/regex_presence_validator.rb

@@ -0,0 +1,16 @@
+class RegexPresenceValidator
+  include RegexSettingValidation
+
+  def initialize(opts = {})
+    @opts = opts
+    initialize_regex_opts(opts)
+  end
+
+  def valid_value?(val)
+    val.present? && regex_match?(val)
+  end
+
+  def error_message
+    I18n.t(@regex_error)
+  end
+end