Fix initialization state diff

[patsissons]

Community Note

Adding some constraints to the initialization block

• ip configuration is now only added if there are any ip's defined
• default data file id is now only added if initialization is non-empty

I was running into this with a dynamic initialization block. When the block was not being created i would see an empty initialization diff being added on every apply.

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relates to #30 (and possibly resolves it)

Release note for CHANGELOG:

BUG FIX: initialization should no longer add an empty block on plan