RSS parser bug in v0.8.4 (html template - ZgotmplZ)

### Description

When parsing certain RSS feeds, the go parser returns `ZgotmplZ` indicating **NULL** or **error**.

Here is a test URL:

```https://samwho.dev/rss.xml```

This value then gets provided for building the item URL and concatenates to form the incorrect feed item:

```https://glance.domain.tld/news#ZgotmplZ```

**2 possible outcomes should be considered:**

1. Revise the parser. Handle errors with additional parse attempts.
2. Filter out / omit NULL entries, noting to the user that invalid RSS XML entries are ignored.

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**Version:** Glance v0.8.4