Allow to precreate with empty index value

[Ladas]

We will allow to precreate record with empty string value, but not yet with nil values. Since nil value will require change in batching and DB check for not null and alternative unique indexes allowing null value. And adding specs for this.

[miq-bot]

Checked commits https://github.com/Ladas/inventory_refresh/compare/1a8c1fb01faf8c85a7a3274c61211163186d0db6~...ff0187790f8b95c174579aa4d981d84b70ed3499 with ruby 2.3.3, rubocop 0.52.1, haml-lint 0.20.0, and yamllint 1.10.0 10 files checked, 29 offenses detected

spec/helpers/test_builder/container_manager.rb

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spec/models/container_group_tag.rb

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spec/models/tag.rb

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spec/schema.rb

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