ctf: Support CTF2 empty structs

[arfio]

What it does

Allow empty structs with no names to be read as they are valid ctf2 structs. Fixes #378

How to test

Open the attached trace of the issue

Follow-ups

N/A

Review checklist

• As an author, I have thoroughly tested my changes and carefully followed the instructions in this template

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 02e5356d-648f-467c-a82b-f64204a4afb1

📥 Commits

Reviewing files that changed from the base of the PR and between b7b6114 and 6e63dda.

📒 Files selected for processing (1)

• ctf/org.eclipse.tracecompass.ctf.core/src/org/eclipse/tracecompass/internal/ctf/core/event/metadata/tsdl/struct/StructParser.java

✨ Finishing Touches

🧪 Generate unit tests (beta)

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