No error when classifying an article without giving PubMed ID

[Nicolás Palopoli]

On the homepage, when trying to “Classify/Submit an article”, a PubMed ID is expected. When the user enters a title, for example ​"​​Exporting an Inherently Harmful Product: The Marketing of Virginia Slims Cigarettes in the United States, Japan, and Korea", and hits “classify”, the server never stops displaying the message “Searching database. Please be patient, this could take a few seconds.....”

A similar thing happens when a PubMed ID- like numeric identifier is entered, such as “3143399999”.

We should check for valid PubMed IDs and/or timeout after X (30?) seconds.