Return early if Devise not defined

Author: andyw8

lib/tapioca/dsl/compilers/devise.rb

@@ -45,8 +45,6 @@ class << self
 
           sig { override.returns(T::Enumerable[Module]) }
           def gather_constants
-            return [] unless defined?(::Devise)
-
             ::Devise.mappings.values.map(&:class_name).map(&:constantize)
           end
         end

spec/tapioca/dsl/compilers/devise_spec.rb

@@ -3,6 +3,8 @@
 
 require "spec_helper"
 
+require "devise"
+
 module Tapioca
   module Dsl
     module Compilers