browser listing Cardiac Synchronization Sequence Attribute as missing for Cardiac Synchronization Technique NONE

[Blechwolf]

Bug description
The DICOM Standard Browser reports the Cardiac Synchronization Sequence Attribute (0018,9118) as missing with the Cardiac Synchronization Technique Attribute (0018,9037) set to NONE.

Steps for reproduction
Upload an Enhanced CT File with the Cardiac Synchroniztation Sequence Attribute missing and the Cardiac Synchronization Technique set to NONE.

Expected behavior
The Cardiac Synchronization Seqeunce Attribute shall be set to ignore.

Additional context (e.g. screenshots)