The customer reported that there is an invalid link displayed on the Link manager list even if it has been corrected.

Steps to reproduce:
1. Create and publish an article with an external link to the unexistent site.
2. Run the php bin/ezplatform:check-urls command from the commandline.
3. Go to the Link management page - the created link will be displayed with Invalid status.
4. Edit the previously created article and update the link making it leading to an existing address.
5. Run the command once again.

Result:
On there will be still invalid link visible on the Link manager list.