feedback: prevent empty submit (fixes #2357) #2358
Merged
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fixes #2357
![image](https://private-user-images.githubusercontent.com/64019708/263289532-1904b04a-cb38-4caa-83a5-212c1f2d639b.png?jwt=eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.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.R5cCCWhdlL9vjlYU8uRgd11_jijkmoSYftWyp5yTuPk)
show message if user tries to submit an empty string