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The must_be_empty validator always treats select multiple components as not being empty, since the value comes as an array. A value of zero counts as empty.
Comments
Comment #1
Liam Morlandhttp://drupalcode.org/project/webform_validation.git/commitdiff/45ece9b
Comment #2
Liam MorlandComment #3
Liam MorlandDrupal 6 is no longer supported.