Fix panicking Option unwraping in match arm analysis Hi, first PR here! I've noticed my IDE sometimes briefly becoming pretty slow to respond while writing Rust. When checking the logs I found reams of this same error repeating itself. ``` thread 'Worker' panicked at 'called `Option::unwrap()` on a `None` value' crates/ide-assists/src/handlers/convert_match_to_let_else.rs:90:46 ``` RA seemed to have been panicking on virtually every keystroke I made whenever I was part way through writing/refactoring a match statement of relevance to this assist. The fix in this PR should be self-explanatory.
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