bug: ccda import fails on empty postParseEvent

[stephenwaite]

Describe the bug

origin:
https://community.open-emr.org/t/nothing-to-display-uploading-a-valid-c-cda-file-to-care-coordination-for-import

looks like the ccda export is adding an odd <component/> after the immunizations, in these cases believe it's where there are no immunizations to be reported, not sure if exploring this would mean going into the ccdaservice js world

To Reproduce

Steps to reproduce the behavior:

1. Add a '....'
2. Click on '....'
3. Scroll down to '....'
4. See error

Expected behavior

Client configuration

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• OpenEMR version:
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