DefaultResponseErrorHandler.hasError doesn't tolerate unknown status codes [SPR-16108]

**[Juergen Hoeller](https://jira.spring.io/secure/ViewProfile.jspa?name=juergen.hoeller)** opened **[SPR-16108](https://jira.spring.io/browse/SPR-16108?redirect=false)** and commented

While the backport for #20529 addressed several issues, it unfortunately missed `DefaultResponseErrorHandler.hasError` which should simply return `false` for unknown status codes.

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**Affects:** 4.3.12

**Issue Links:**
- #20529 RestTemplate doesn't consistently tolerate unknown HTTP status codes
- #20918 RestTemplate.ResponseEntityResponseExtractor doesn't tolerate unknown status codes
- #21971 RestTemplate does not throw exception for custom error codes
- #21145 DefaultResponseErrorHandler wastes the body of a response with an unknown status

**Referenced from:** commits https://github.com/spring-projects/spring-framework/commit/d963597ec076da41a238659271ada292f3540275, https://github.com/spring-projects/spring-framework/commit/ab19c227d39da9c0a6b09992734d2cf1848ef92e


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DefaultResponseErrorHandler.hasError doesn't tolerate unknown status codes [SPR-16108] #20656

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DefaultResponseErrorHandler.hasError doesn't tolerate unknown status codes [SPR-16108] #20656

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