check the externalId is not blank or empty before adding it.
this covers the existing case where a credential was created before the externalId field was introduced (null) as well as after it was where it would be converted to an empty String (which is not a valid external id)
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Fixes #116
check the
externalIdis not blank or empty before adding it.this covers the existing case where a credential was created before the externalId field was introduced (null) as well as after it was where it would be converted to an empty String (which is not a valid external id)