configor.processDefaults(config) should notify on error

[chrisxuwq]

configor/utils.go

Line 375 in 591dd19

configor.processDefaults(config)

I have encountered an issue that default config did not get load fully and no error returned. It turned out that during process default, an error occured and returned error but discarded by function call.

I think should at least log error for this

[EdwardShen125]

I encountered the same issue after updating to version 1.2.2, where upgrading to YAML v3 resulted in validation errors for type time.Duration.
PR #90