How to reproduce

• connect to cms
• create a page "?" (or 1 or more special characters, but without letter or number)

Actual behavior

• a pop-up is displayed about an error: "Une erreur est survenue lors de la création de la page.
  Il est conseillé d'actualiser votre vue avant de recommencer car un autre utilisateur a peut-être modifié l'arbre."
  Detail :
  Child name cannot be null, empty or absolute

org.ametys.plugins.repository.AmetysRepositoryException: Child name cannot be null, empty or absolute
at org.ametys.plugins.repository.jcr.TraversableAmetysObjectHelper.hasChild(TraversableAmetysObjectHelper.java:249)
at org.ametys.plugins.repository.jcr.DefaultTraversableAmetysObjectFactory.hasChild(DefaultTraversableAmetysObjectFactory.java:76)
at org.ametys.plugins.repository.jcr.DefaultTraversableAmetysObject.hasChild(DefaultTraversableAmetysObject.java:50)
at org.ametys.web.repository.page.CreatePageAction.act(CreatePageAction.java:68)
at org.apache.cocoon.components.treeprocessor.sitemap.ActTypeNode.invoke(ActTypeNode.java:125)
[...]
at org.ametys.runtime.plugins.core.dispatcher.DispatchGenerator._dispatching(DispatchGenerator.java:132)
at org.ametys.runtime.plugins.core.dispatcher.DispatchGenerator.generate(DispatchGenerator.java:81)
at org.apache.cocoon.components.pipeline.AbstractProcessingPipeline.processXMLPipeline(AbstractProcessingPipeline.java:579)
[...]
at org.ametys.runtime.servlet.RuntimeServlet._doService(RuntimeServlet.java:127)
at org.ametys.runtime.servlet.RuntimeServlet.service(RuntimeServlet.java:86)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:729)
[...]
at java.lang.Thread.run(Thread.java:619)

Expected behavior

• no error