Fix text answer validation and limit length
The previous validation did not allow null
for the body which
prevented abstentions. The length of the String is now validated
to be 1-500 (500 is also used by the webclient).
While the validation has always been incorrect, it was not applied until recently.
Closes: #167 (closed)
Regression-MR: !533 (merged)
Edited by Daniel Gerhardt