Fix an error when the bucket ACL doesn't exist

libraries/google_storage_bucket_acl.rb

@@ -18,9 +18,15 @@ def initialize(opts = {})
       super(opts)
       @bucket = opts[:bucket]
       @entity = opts[:entity]
-      catch_gcp_errors do
+      begin
         @acl = @gcp.gcp_storage_client.get_bucket_access_control(@bucket, @entity)
         create_resource_methods(@acl)
+        # all non-existing entities raise a "Not Found" client error
+      rescue Google::Apis::ClientError => e
+        # re-raise the exception if the error is not "Not Found"
+        raise e unless e.status_code == 404
+        @acl = nil
+        @error = JSON.parse(e.body)
       end
     end
 

test/integration/verify/controls/google_storage_bucket_acl.rb

@@ -18,4 +18,7 @@
     its('bucket') { should eq gcp_storage_bucket_acl }
   end
 
-end
+  describe google_storage_bucket_acl(bucket: gcp_storage_bucket_acl, entity: 'allUsers') do
+    it { should_not exist }
+  end
+end