[Bug] The "is monitored" returns null when unmonitored

[RouNNdeL]

Describe the bug
The is monitored rule will return null instead of false when a movie is unmonitored in Radarr (I have not check Sonarr).

To Reproduce
Steps to reproduce the behavior:

1. Have unmonitored movies in Radarr
2. Create a rule using Radarr - is monitored equals false rule
3. Run the rules
4. The rule will fail to match unmonitored Movies
5. Change the rule to Radarr - is monitored not equals true
6. The rule will now correctly match the Movies

Expected behavior
The workaround with setting the rule to not equal true works but not obvious, so I assume this is a bug. Expected behavior would be to match the rule when the movie is unmonitored.

Screenshots

Current behaviour:

- operator: OR
  action: equals
  firstValueName: Radarr - is monitored
  firstValue: null
  secondValueName: boolean
  secondValue: 0
  result: false

Workaround:

- operator: OR
  action: not_equals
  firstValueName: Radarr - is monitored
  firstValue: null
  secondValueName: boolean
  secondValue: 1
  result: true

Expected behaviour:

- operator: OR
  action: equals
  firstValueName: Radarr - is monitored
  firstValue: 0
  secondValueName: boolean
  secondValue: 0
  result: true

Device (please complete the following information):

• OS: Docker
• Version: 2.0.2

Additional context

None.