Umbraco 7. Can't leave numeric field empty - umbraco

I am correctly upgrading a version 6.0.5 umbraco instance to version 7. The install seems to have been successful and all database changes seem to have completed as planned. However when trying to save a content node which contains a not required numeric field with no content supplied in the field, it fails to save with a validation error stating "The value is not a valid integer".
Has anyone else found this issue and a way to fix it as it's stopping me proceeding with the upgrade?
Thank you in advance
Dave

This has been added as a confirmed issue after other people could replicate it.
See my Umbraco forum post here.
Umbraco issue details available here
Thank you for the help
Dave

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