At the Detail step of the Record Wizard, do

• Click "Local list"
• Remove all text from the "Title" field
• Click "Done"

Now, there is no chance to exit this dialog window forever and ever. You can only reload the page or close the browser window

There is already a built-in error message when you type an erroneous pagename. Something to the effect of if inputString==null then return error will fix this issue. Need to find where are the bricks, and to test it.