fix: no default values when unexpected errors occurred

[yangby-cryptape]

What this PR does / why we need it:

This PR:

• Remove unwrap_or_default for unexpected errors.

• Set default value directly instead of unwrap_or_default.

  • const fn for traits is not released (today, latest toolchain is 1.71.0), set a const value with unwrap_or(const_value) is better than unwrap_or_default, since unwrap_or_default will call the Default::default(..) function.
    p.s. -O3, even -O2, may ignore the call, set const value directly.

  • More readability, a literal value is more clearly than Default::default(..).

Which issue(s) this PR fixes:

Fixes #1287

Which docs this PR relation:

Ref #

Which toolchain this PR adaption:

No Breaking Change

Special notes for your reviewer:

NIL

CI Description

CI Name	Description
Chaos CI	Test the liveness and robustness of Axon under terrible network condition
Cargo Clippy	Run cargo clippy --all --all-targets --all-features
Coverage Test	Get the unit test coverage report
E2E Test	Run end-to-end test to check interfaces
Code Format	Run cargo +nightly fmt --all -- --check and cargo sort -gwc
Web3 Compatible Test	Test the Web3 compatibility of Axon
v3 Core Test	Run the compatibility tests provided by Uniswap V3
OCT 1-5 | 6-10 | 11 | 12-15 | 16-19	Run the compatibility tests provided by OpenZeppelin

CI Usage

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CI Switch

• Chaos CI
• Cargo Clippy
• Coverage Test
• E2E Tests
• Code Format
• Unit Tests
• Web3 Compatible Tests
• OCT 1-5 And 12-15
• OCT 6-10
• OCT 11
• OCT 16-19
• v3 Core Tests