Consider empty string as zero in number fields [#3238318]

Problem/Motivation

If a field (column) is an integer data type but not value is given, the validation kicks in and complains that empty is not a number. It would be convenient if an empty string for an integer data type can be consider a value of 0.

Proposed resolution

Skip validation for empty fields (columns).

Issue fork excel_importer-3238318

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tsega-1.1.x-patch-75020 changes, plain diff MR !14
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