Parser drops everything after empty yaml doc

[Cenness]

Discussion?
No

Describe the bug
On multidoc yaml input dasel drops all elements after first empty doc.

To Reproduce

1. Create yaml

first: nonempty
---

---
second: nonempty
---

2. Run cat md.yaml | dasel -r yaml -w yaml
3. Get

first: nonempty

Expected behavior

$ cat md.yaml | yq
first: nonempty
---

---
second: nonempty
---

Screenshots
N/A

Desktop:

• OS: Debian 12
• Version: dasel version v2.8.1

Additional context

• yq is mikefarah/yq
• Multidoc yaml with empty docs in the middle can be seen in the wild on helm charts when entire template file is skipped due to some condition.
• cat md.yaml | yq -o json | dasel -r json -w yaml crashes into panic, which is preferable to silently skipping payload
• v3 panics with runtime error: invalid memory address or nil pointer dereference