fix(language-service): remove asserts for non-null expressions #16422
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Reworked some of the code so asserts are no longer necessary.
Added additional and potentially redundant checks
Added checks where the null checker found real problems.
What kind of change does this PR introduce? (check one with "x")
What is the current behavior? (You can also link to an open issue here)
Language service used postfix '!' to avoid struct null checking errors.
What is the new behavior?
Removed most of the postfix '!' as described above.
Does this PR introduce a breaking change? (check one with "x")