Fix #234, proper error handling (#251)

* Fix #234 - Improves error handling for invalid schemas

Author: pderaaij

CHANGELOG.md

@@ -4,6 +4,10 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](http://keepachangelog.com/en/1.0.0/)
 and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.html).
 
+## Unreleased
+### Fixed
+- Correct handling of displaying validation and linting errors ([#234])
+
 ## [0.8.6] - 2018-12-18
 ### Added
 - `notContain` rulesets can now support pattern matching. ([#208] via [@erunion])

lint.js

@@ -80,9 +80,9 @@ const command = async (specFile, cmd) => {
     );
 
     validator.validate(spec, buildValidatorOptions(skip, verbose), (err, _options) => {
-        const { context, lintResults } = _options;
+        const { context, lintResults, valid } = _options || err.options;
 
-        if (err) {
+        if (err && valid === false) {
             console.error(colors.red + 'Specification schema is invalid.' + colors.reset);
             console.error(formatSchemaError(err, context));
             process.exit(1);