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fix: error instead of panic for hardened blinding keys #430

Job	Run time
Test - stable toolchain	10m 58s
Check WASM	40s
Docs - stable toolchain (recent)	45s
Prepare	5s
Test - nightly toolchain	10m 55s
Lint - nightly toolchain (recent)	51s
Docs - nightly toolchain (recent)	49s
Test - MSRV	27m 40s
	52m 43s