fix: use output amount if there is no other balance for an output address

[begonaalvarezd]

Description of change

Close #1185
Intends to fix the balance for the migrator chain alias address https://explorer.iota.org/mainnet/addr/iota1pphx6hnmxqdqd2u4m59e7nvmcyulm3lfm58yex5gmud9qlt3v9crs9sah6m

Type of change

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• Bug fix (a non-breaking change which fixes an issue)
• Enhancement (a non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation Fix

How the change has been tested

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Change checklist

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• [] My code follows the contribution guidelines for this project
• [] I have performed a self-review of my own code
• [] I have commented my code, particularly in hard-to-understand areas
• [] I have made corresponding changes to the documentation
• [] I have added tests that prove my fix is effective or that my feature works
• [] New and existing unit tests pass locally with my changes

[brancoder]

The storage deposit is displayed on the NFT address page as the available balance.