getTriggeredCondition().getDescription() returns title instead of description

Expected Behavior

I expect the getTriggeredCondition().getDescription() method to return the description of the event definition, but instead it returns the title, just as getTitle() does.

Current Behavior

getTriggeredCondition().getDescription() returns the exact same thing as getTitle(), i.e. the title.

Possible Solution

(very unfamiliar with Java, haven't been able to dig into the code that far)

Steps to Reproduce (for bugs)

There are surely other ways to reproduce this issue, but this is what I do: (my way obviously requires an opsgenie subscription etc)

git clone the opsgenie graylog notification plugin (https://github.com/opsgenie/opsgenie-graylog-plugin)
in /src/main/java/com/opsgenie/plugin/graylog/OpsGenieGraylogClient.java, the description string is built on line 125

I edit the string to contain the methods in question

  .append("Event title: ").append(checkResult.getTriggeredCondition().getTitle()).append("\n")
  .append("Event description: ").append(checkResult.getTriggeredCondition().getDescription()).append("\n")

Build and install the plugin.

Trigger an event. This results in a description in opsgenie as follows:

Event title: Andreas testing OpsGenie
Event description: Andreas testing OpsGenie

However it should be:
```
Event title: Andreas testing OpsGenie
Event description: This is a description
```
as that is what is configured in the event definition in graylog.

Context

I'm ultimately trying to get the description of the event to be sent to OpsGenie, so I can provide context information regarding the defined event to the user that is tasked with solving the particular problem.

Your Environment

Graylog Version: 3.3.2 (also tested in 3.1.2, same behaviour)
Elasticsearch Version: 6.8.5
MongoDB Version: 4.0.10
Operating System: Debian 10
Browser version: Safari 13.1.1

Graylog2 / graylog2-server