213 incorrect error message when validator is used with if or on #217

Job	Run time
minitest (2.6, rails_6_0, vips)	42s
minitest (2.6, rails_6_0, mini_magick)	47s
minitest (2.6, rails_6_1, vips)	43s
minitest (2.6, rails_6_1, mini_magick)	2m 18s
minitest (2.7, rails_6_0, vips)	39s
minitest (2.7, rails_6_0, mini_magick)	59s
minitest (2.7, rails_6_1, vips)	1m 46s
minitest (2.7, rails_6_1, mini_magick)	1m 29s
minitest (2.7, rails_7_0, vips)	58s
minitest (2.7, rails_7_0, mini_magick)	56s
minitest (2.7, rails_next, vips)	53s
minitest (2.7, rails_next, mini_magick)	42s
minitest (3.0, rails_6_1, vips)	34s
minitest (3.0, rails_6_1, mini_magick)	33s
minitest (3.0, rails_7_0, vips)	29s
minitest (3.0, rails_7_0, mini_magick)	34s
minitest (3.0, rails_next, vips)	44s
minitest (3.0, rails_next, mini_magick)	29s
minitest (3.1, rails_7_0, vips)	27s
minitest (3.1, rails_7_0, mini_magick)	46s
minitest (3.1, rails_next, vips)	41s
minitest (3.1, rails_next, mini_magick)	35s
minitest (3.2, rails_7_0, vips)	26s
minitest (3.2, rails_7_0, mini_magick)	34s
minitest (3.2, rails_next, vips)	36s
minitest (3.2, rails_next, mini_magick)	43s
	21m 3s

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