fix: guard empty MsgSend amounts

[0xApotheosis]

Description

Guards MsgSend parsing so empty amount collections are skipped before Amount[0].

• Covers custom and bank sends across THORChain, MayaChain, and Cosmos.
• Adds regression coverage for empty amounts.
• Fixes the thorchain-v1 Railway watch path so shared THORChain changes trigger a rebuild.

Addresses FOX-295.

Verification

• GOTOOLCHAIN=go1.25.4 go test ./... in go/pkg/thorchain
• GOTOOLCHAIN=go1.25.4 go test ./... in go/pkg/cosmos
• MayaChain test compilation reached the link step locally; the macOS host cannot link the repository Linux-only libzec.so.

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