bump-formula-pr: fix check_all_pull_requests

Library/Homebrew/dev-cmd/bump-formula-pr.rb

@@ -515,7 +515,7 @@ module Homebrew
       version = Version.detect(url, specs)
     end
     # if we haven't already found open requests, try for an exact match across all requests
-    pull_requests = fetch_pull_requests("#{formula.name} #{version}", tap_full_name) if pull_requests.blank?
+    pull_requests = fetch_pull_requests("#{formula.name} #{version}", tap_full_name)
     check_for_duplicate_pull_requests(pull_requests, args: args)
   end