Handle empty definitions

[robmck1995]

Description

• Fixed a bug in the LspClient trait implementation where a null result would cause deserialization to fail by defaulting to an empty array.
• Improved error handling for the goto definition response.

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Changes walkthrough

	Relevant files
Bug fix	client.rs Handle null result in goto definition response                                  lsproxy/src/lsp/client.rs Added handling for null result by defaulting to an empty array. Prevented deserialization failure when result is null. +7/-1

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Things to consider 🐛

• The code at line 232 checks if the result is null and defaults to an empty array response. However, it does not handle the case where result might be an invalid JSON that is neither null nor a valid GotoDefinitionResponse. This could lead to a runtime error when serde_json::from_value(result)? is called on an invalid JSON structure. Consider adding error handling for this scenario.