Exclude empty proofs; 0x0 for 0 instead of 0x

[flcl42]

Resolves #7759

Remove the difference in responses of proof API

Changes

• Exclude empty proofs for not found from results
• No leading zeros for proof value
• 0 means 0x0 instead of 0x (null/empty array)

Types of changes

What types of changes does your code introduce?

• Bugfix (a non-breaking change that fixes an issue)
• New feature (a non-breaking change that adds functionality)
• Breaking change (a change that causes existing functionality not to work as expected)
• Optimization
• Refactoring
• Documentation update
• Build-related changes
• Other: Description

Testing

Requires testing

• Yes
• No

If yes, did you write tests?

• Yes
• No

[MarekM25]

#7759 @flcl42 qq: does it fix this issue or it is something different?

[flcl42]

#7759 @flcl42 qq: does it fix this issue or it is something different?

Yep, seems like that. We are getting empty storage proof values and want not to return em anymore