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In 3.1.1 and 3.1.6 form_text_input gives an error message when leaving the form title empty. In some questionnaire-type experiments, this is what we want however. Typing in a space does not solve the problem either.
We need to see some code. Please provide the code for your text_input item and the error message.
Easy solutions without changing the form:
Indeed, as @DahmSF points out, there are a few simple workarounds. Another one: Just enter <span></span>, which corresponds to an invisible span with nothing in it.
But still, it's confusing behavior, so I created an issue (#518) for it. Thanks for pointing this out!
Hi all (sorry for the late response, my notifications were in my spam folder..),
Thanks for filing an issue on it, Sebastiaan. And thanks for the workarounds; they're very valuable for our students to know.