Fix error when fetching followers/following from REST API when user has network hidden (#12716)

Fix #12510

app/controllers/api/v1/accounts/follower_accounts_controller.rb

@@ -25,7 +25,7 @@ class Api::V1::Accounts::FollowerAccountsController < Api::BaseController
   end
 
   def hide_results?
-    (@account.user_hides_network? && current_account.id != @account.id) || (current_account && @account.blocking?(current_account))
+    (@account.user_hides_network? && current_account&.id != @account.id) || (current_account && @account.blocking?(current_account))
   end
 
   def default_accounts

app/controllers/api/v1/accounts/following_accounts_controller.rb

@@ -25,7 +25,7 @@ class Api::V1::Accounts::FollowingAccountsController < Api::BaseController
   end
 
   def hide_results?
-    (@account.user_hides_network? && current_account.id != @account.id) || (current_account && @account.blocking?(current_account))
+    (@account.user_hides_network? && current_account&.id != @account.id) || (current_account && @account.blocking?(current_account))
   end
 
   def default_accounts