bug(filesystem): appendFile crash on android if no base64

[jcesarmobile]

Bug Report

Plugin(s)

filesystem

Capacitor Version

3.x

Platform(s)

android

Current Behavior

app crash if the provided string is not proper base64

Expected Behavior

appendFile should error instead of crashing

Code Reproduction

https://github.com/jcesarmobile/issue-5541

Other Technical Details

Additional Context

[jcesarmobile]

this has been fixed in 4.0.0 beta 0

[ionitron-bot]

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