fix: returns all tokens with zero balance when rpc call fails

[genaroibc]

Description

When getting evm balances, if the RPC call fails (usually the rpc is broken) the sdk returns an empty array for tokens, instead of tokens with balance: 0. This ends up in the widget displaying an empty tokens list:

Type of change

• Bug fix (non-breaking change which fixes an issue)

How Has This Been Tested?

After the fix, the tokens load correctly (the underlying issue is not fixed though, the rpc is down)

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• Any dependent changes have been merged and published in downstream modules