fix: error handling in Provider for when a node is offline

[arthurgeron]

Release notes

In this release, we:

• Fixed error handling in Provider for when a node is offline

Summary

If a node is offline, the Provider middleware throws an exception when it tries to inject the auth headers into an undefined request object, so we check if the request object is valid before injecting auth headers.

Checklist

• All changes are covered by tests (or not applicable)
• All changes are documented (or not applicable)
• I reviewed the entire PR myself (preferably, on GH UI)
• I described all Breaking Changes (or there's none)

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[arboleya]

Thanks for the PR @arthurgeron! ❤️

I applied some touchups to the PR description.

Oops, too early. Tests failing.

[github-actions]

Coverage Report:

Lines	Branches	Functions	Statements
79.37%(+0%)	72.15%(+0.02%)	77.73%(+0%)	79.43%(+0%)

Changed Files:

Ok	File (✨=New File)	Lines	Branches	Functions	Statements
🔴	packages/account/src/providers/provider.ts	71.15% (+0%)	64.87% (+0.34%)	74.19% (+0%)	70.79% (+0%)