Add unit tests for distribute_dividend reverting when creator has zero total supply

[Chucks1093]

Summary

Distributing a dividend to a creator with zero total supply is meaningless and should revert to prevent XLM being locked in the contract with no holders to claim it.

Scope

• Register a creator but do not buy any keys (total supply remains zero)
• Attempt to call distribute_dividend and assert it reverts with a descriptive error
• Assert no XLM was transferred from the caller

Acceptance Criteria

• Distribution reverts when total supply is zero
• Caller XLM balance unchanged after the revert
• Error variant is descriptive and distinct from other error types

ETA: 12 hours

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Coordinate on Telegram

[adeboladee]

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Hello maintainer, Please I would like to work on this issue

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[Buchi-Einstein]

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[Bolajiomo99]

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[Godsmiracle001]

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can i fix this?

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[grantfox-oss]

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@Godsmiracle001's PR #498 was approved and merged by @Chucks1093.

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