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travis-ci

Nullable hostname (#2448)

Change `hostname` of `Asset` (`DataCenterAsset` and `BackOfficeAsset`) to `NullableCharField`. This will result in saving empty `hostname` as `null` instead of empty string (`''`) to the database, which might help in the future using `hostname` column as a "clickable" column in admin or to mark `hostname` as unique (`null != null`, but `'' == ''`).

There is also minor change in `NullableCharField` as well - `to_python` now returns `None` instead of `''` in case of empty value - this affects only read-only views (like admin listing) - form fields would work as usual.

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