Fix r66791

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@66792 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

spec/ruby/core/proc/block_pass_spec.rb

@@ -28,7 +28,6 @@ ruby_version_is ""..."2.8" do
 
     it "remains the same object if re-vivified by the target method" do
       warning = ruby_version_is("2.7") {/tried to create Proc object without a block/}
-      warning ||= ''
 
       p = Proc.new {}
       p2 = nil