added null check for body

Signed-off-by: Dave Shanley <[email protected]>

Author: daveshanley

responses/validate_response.go

@@ -37,7 +37,7 @@ func ValidateResponseSchema(
 
 	var validationErrors []*errors.ValidationError
 
-	if response == nil {
+	if response == nil || response.Body == nil {
 		// cannot decode the response body, so it's not valid
 		violation := &errors.SchemaValidationFailure{
 			Reason:          "response is empty",