remove unwrap calls #495

Job	Run time
Rustfmt	13s
Clippy	2m 59s
Build Wasm Examples (wasm-yew-minimal)	49s
Build Examples (3d_charts)	30s
Code Coverage	8s
Build Wasm Examples (wasm-yew-callback-minimal)	49s
Build Examples (basic_charts)	25s
semver	39s
Build Examples (custom_controls)	21s
Tests (ubuntu-latest)	1m 57s
Build Examples (financial_charts)	22s
Tests (windows-latest)	4m 47s
Build Examples (images)	38s
Tests (macos-latest)	2m 55s
Build Examples (kaleido)	1m 30s
Build Examples (maps)	21s
Build Examples (ndarray)	23s
Build Examples (scientific_charts)	21s
Build Examples (shapes)	24s
Build Examples (subplots)	21s
	20m 52s

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