Bug report: crash the output pane using entropy and AES

**Describe the bug**
Adding AES encrypt after Entropy causes the output pane to crash and show JS/HTML rather than output.

**To Reproduce**
Steps to reproduce the behaviour or a link to the recipe / input used to cause the bug:

1. Put text into the input
2. Add the entropy operation
3. Add AES Encrypt operation - The output crashes with a JS error
4. Pause encryption operation - The output shows the entropy details with the JS/HTML for the nice graph that should be there. The entropy values update as the input is updated, so the operation is still working at some level.

**Expected behaviour**
AES operation shouldn't crash when started and it crashing shouldn't take down the other operations.

**Screenshots**




**Desktop (if relevant, please complete the following information):**

Running the latest Docker image in Chrome on Ubuntu.

```
docker run -it -p 9090:80 ghcr.io/gchq/cyberchef:latest
```

Reproduce the issue in CyberChef with text input, Entropy, and AES Encrypt using the Docker image in Chrome on Ubuntu. Start by examining the output pane behavior and the Entropy/AES operation interaction; done means AES no longer crashes the output and the other operation output remains usable.

Written by the indexing model from the issue text.