Case 1:
Steps to reproduce:

1. Navigate to Administration → Media types.
2. Create a media type of type "Webhook".
3. Fill all mandatory fields.
4. Leave "Parameters" as is.
5. Save the new media type and export it.
6. Open XML export file in any code editor.

Result:

...
<parameters>
    <parameter>
        <name>URL</name>
        <value/>
    </parameter>
    ...
</parameters>
...

Expected:

...
<parameters>
    <parameter>
        <name>URL</name>
    </parameter>
    ...
</parameters>
...

Case 2:
Steps to reproduce:

1. Navigate to Administration → Media types.
2. Open the previously created media type configuration.
3. Remove all "Parameters".
4. Save the media type and export it.
5. Open XML export file in any code editor.

Result:
Tag <parameters/> is present in XML.

Expected:
Tag <parameters/> should not be present in XML.