Minor improvements after latest review

Signed-off-by: Rémy Coutable <remy@rymai.me>

app/models/concerns/repository_mirroring.rb

 module RepositoryMirroring
-  IMPORT_REFS = %w[
-    +refs/heads/*:refs/heads/*
-    +refs/tags/*:refs/tags/*
-  ].freeze
+  IMPORT_HEAD_REFS = '+refs/heads/*:refs/heads/*'.freeze
+  IMPORT_TAG_REFS = '+refs/tags/*:refs/tags/*'.freeze
 
   def set_remote_as_mirror(name)
     # This is used to define repository as equivalent as "git clone --mirror"
@@ -13,11 +11,9 @@ module RepositoryMirroring
 
   def set_import_remote_as_mirror(remote_name)
     # Add first fetch with Rugged so it does not create its own.
-    raw_repository.rugged.config["remote.#{remote_name}.fetch"] = IMPORT_REFS.first
+    raw_repository.rugged.config["remote.#{remote_name}.fetch"] = IMPORT_HEAD_REFS
 
-    IMPORT_REFS.drop(1).each do |refspec|
-      add_remote_fetch_config(remote_name, refspec)
-    end
+    add_remote_fetch_config(remote_name, IMPORT_TAG_REFS)
 
     raw_repository.rugged.config["remote.#{remote_name}.mirror"] = true
     raw_repository.rugged.config["remote.#{remote_name}.prune"] = true

lib/github/representation/issuable.rb

@@ -28,9 +28,7 @@ module Github
       end
 
       def labels
-        return [] unless labels?
-
-        @labels ||= raw['labels'].map do |label|
+        @labels ||= Array(raw['labels']).map do |label|
           Github::Representation::Label.new(label, options)
         end
       end

lib/github/representation/issue.rb

@@ -18,9 +18,7 @@ module Github
       end
 
       def assignees
-        return [] unless assigned?
-
-        @assignees ||= raw['assignees'].map do |user|
+        @assignees ||= Array(raw['assignees']).map do |user|
           Github::Representation::User.new(user, options)
         end
       end