[font] throw when loading empty font file

[vonovak]

Why

This PR adds a check to prevent loading empty font files on Android. This normally wouldn't happen but if it did, Android TypeFace throws ArrayIndexOutOfBoundsException which is pretty useless for debugging.

How

Added a simple check in the FontLoaderModule.kt file that verifies if the font file has a non-zero length before attempting to create a Typeface from it. If the file is empty (length is 0), it throws a CodedException with a error message that's better than ArrayIndexOutOfBoundsException.

Test Plan

• bare expo

Checklist

• I added a changelog.md entry and rebuilt the package sources according to this short guide
• This diff will work correctly for npx expo prebuild & EAS Build (eg: updated a module plugin).
• Conforms with the Documentation Writing Style Guide

[vonovak]

• [font] throw when loading empty font file #38229 👈 (View in Graphite)
• [asset] fix file scheme handling in downloadAsync #38227
• main

This stack of pull requests is managed by Graphite. Learn more about stacking.

[expo-bot]

The Pull Request introduced fingerprint changes against the base commit: acc2abd

Fingerprint diff

[
  {
    "op": "changed",
    "beforeSource": {
      "type": "dir",
      "filePath": "../../packages/expo-font/android",
      "reasons": [
        "expoAutolinkingAndroid"
      ],
      "hash": "c2e452a3401e195afc849d4c6d3ac6161a8f89d4"
    },
    "afterSource": {
      "type": "dir",
      "filePath": "../../packages/expo-font/android",
      "reasons": [
        "expoAutolinkingAndroid"
      ],
      "hash": "4a66a1b5b2ac878f4eaf482f021cfeb9ec9f36f3"
    }
  }
]

---

Generated by PR labeler 🤖

[github-actions]

Subscribed to pull request

File Patterns	Mentions
packages/expo-asset/**	@aleqsio, @wschurman
packages/expo-font/**	@alanjhughes

Generated by CodeMention

[aleqsio]

looks good

[vonovak]

Merge activity

• Jul 22, 11:52 AM UTC: A user started a stack merge that includes this pull request via Graphite.
• Jul 22, 11:54 AM UTC: Graphite rebased this pull request as part of a merge.
• Jul 22, 11:55 AM UTC: @vonovak merged this pull request with Graphite.

[expo-bot]

Hi there! 👋 I'm a bot whose goal is to ensure your contributions meet our guidelines.

I've found some issues in your pull request that should be addressed (click on them for more details) 👇

⚠️ Suggestion: Missing changelog entries

Your changes should be noted in the changelog, e.g.:
- throw when loading empty font file ([#38229](https://github.com/expo/expo/pull/38229) by [@vonovak](https://github.com/vonovak))
Read Updating Changelogs guide and consider adding an appropriate entry to the following changelogs:

• packages/expo-font/CHANGELOG.md

---

Generated by ExpoBot 🤖 against 48b6844