The edit summary text field when submitting an edit does not validate space. A user can press the space bar a few times and submit the summary without any description.
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1I am not sure if this is intended but think is a Bug. As there is a word restriction in it. So I guess users are expected to put something before saving – user2720864 Sep 10 '13 at 20:44
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I think it’s more a safeguard against accidental submission; an edit message isn’t required once you have editing privileges, and space-only suggested edit summaries aren’t likely to be accepted. (Not to say that this isn’t a valid bug.) – Ry- Sep 10 '13 at 21:28