Unnecessary clearing of diagnostics

[piotmag769]

Currently if there is a panic during diagnostics calculation we log an error and use a default value (empty diagnostics).

cairols/src/lang/diagnostics/file_diagnostics.rs

Lines 82 to 85 in 05a2249

	query!(db.module_semantic_diagnostics(module_id))
	.map(Result::unwrap_or_default)
	.unwrap_or_default()
	.get_all(),

This can cause blinking of diagnostics bcs we may clear already existing ones. Instead we should use previously calculated diagnostics to not clear any existing diagnostics