Update behavior when validating schema

Only an object should check for required properties.

Author: feenst

lib/validators/spec.js

@@ -330,6 +330,14 @@ function validateRequiredPropertiesExist (schema, schemaId) {
     }
   }
 
+  // The "required" keyword is only applicable for objects
+  if (Array.isArray(schema.type) && !schema.type.includes("object")) {
+    return;
+  }
+  else if (!Array.isArray(schema.type) && schema.type !== "object") {
+    return;
+  }
+
   if (schema.required && Array.isArray(schema.required)) {
     let props = {};
     collectProperties(schema, props);