Linter silently fails on null value error

[wolfkarl]

AWSTemplateFormatVersion: "2010-09-09"
Resources:
  # Unsupported Type "AWS::EC2::Instance1"
  MyEC2Instance1:
    Type: "AWS::EC2::Instance1"
      Metadata:

This minimal config makes the linter fail silently -- no errors are shown.

Running cfn-lint manually returns E0000 Null value at line [...]

[rdkls]

This is because --ignore-bad-template is supplied to cfn-lint https://github.com/aws-cloudformation/cfn-lint-atom/blob/60f95f6a74c989c19e8fbe46cd884efaf71ef1df/lib/atom-cfn-lint.js#L168

@kddejong would you be OK with us removing this? Can make PR