Crash due to unwrap on None in tree_error_analysis

[VictosVertex]

Another crash resulted due to an unsafe unwrap

[2024-07-18T08:07:40Z INFO  asp_lsp] Time needed for first time generating the document: 18.901181ms
[2024-07-18T08:07:40Z INFO  asp_lsp::semantics] Time needed for starting up semantic analysis: 41.787µs
[2024-07-18T08:07:40Z INFO  asp_lsp::semantics] Time needed for semantic analysis: 21.278323ms
[2024-07-18T08:07:40Z INFO  asp_lsp::semantics] Time needed for semantic analysis cleanup: 683.397µs
thread 'main' panicked at src/diagnostics/tree_error_analysis.rs:43:22:
called `Option::unwrap()` on a `None` value
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace
[Error - 10:07:40 AM] The ASP language server server crashed 5 times in the last 3 minutes. The server will not be restarted. See the output for more information.