Do not validate empty values

1 job for cbenz-master-patch-18260 in 3 minutes and 1 second (queued for 3 seconds)
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Status Job ID Name Coverage
  Test
failed #4439
Run tests

00:03:01

 
Name Stage Failure
failed
Run tests Test

def blank_header(err, schema):
"""blank-header error"""
> column_id = err['message-data']['column-number']
E KeyError: 'column-number'

validata_core/messages.py:61: KeyError
========================= 7 failed, 29 passed in 7.57s =========================
ERROR: Job failed: exit code 1