Blank vs. space (not null) from a database

[Jill Thompson-Weintraub <jilltwfl -at- hotmail -dot- com>]

When referring to the empty contents of a field extracted from a database (the field is not a null), is it preferable to write, "... when the contents of some_field is blank, [the whatever will do something]", or "... when the contents of some_field is a space, [the whatever will do something]". 
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