FIXED: * `envs/funcs.go:78:3: unknown field IgnoreWhiteSpace in struct literal of type EnvErrNoVal, but does have IgnoreWhitespace` * `envs/funcs_enverrnoval.go:15:8: sb.WasFound undefined (type *strings.Builder has no field or method WasFound)`
ADDED: * envs.GetEnvErr(), envs.GetEnvErrNoBlank(), envs.EnvErrNoVal This allows error-returned env vars for nonexistent/empty values.