ignore metadata-reader exception (#4532) #1021

Job	Run time
build phraseanet-nginx / build	3m 18s
build phraseanet-db / build	33s
build phraseanet-fpm / build	3m 34s
build phraseanet-elasticsearch / build	19s
build phraseanet-setup / build	4m 10s
build phraseanet-worker / build	3m 46s
unit test	5m 27s
	21m 7s

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