Unclear error message when issue tracker issue type does not exist

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Describe the bug When the issue configures a non-existing issue type in the issue tracker config, the error message is unclear.

To Reproduce Steps to reproduce the behaviour:

1. Go to issue tracker config
2. Enter issue tracker config with a non-existing issue type
3. Try to create an issue for a metric
4. See error: "Error creating issue: undefined"

Expected behaviour A error message indicating that the issue type does not exist.

Your environment (please complete the following information):

• Quality-time v4.4.0

Additional context Reported by @Sebastiaan127001

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This is a test comment to see whether Sebastiaan gets a notification without mentioning him.

[Sebastiaan127001]

[fniessink]

Won't fix this issue because:

• It's much harder to trigger with recent versions of Quality-time: the user would need to select a Jira project that supports issue type A and then switch to another project that doesn't support issue type A. On top of that, the issue tracker config tab will show that no issue type is selected, using a red background, so it's clear the config is not valid.
• The error message no longer says "undefined", but correctly says there was a client error (400).