Make Show.fromToString null safe #3129

Job	Run time
Submit Dependencies (ubuntu-22.04, temurin@8)	3m 0s
Validate Steward Config (ubuntu-22.04, temurin@11)	20s
Generate Site (ubuntu-22.04, temurin@17)	4m 38s
Scalafix (ubuntu-22.04, temurin@8)	2m 47s
Test (ubuntu-22.04, 2.12, temurin@8, catsJVM)	9m 47s
Test (ubuntu-22.04, 2.13, temurin@8, catsJS)	9m 49s
Test (ubuntu-22.04, 2.13, temurin@8, catsNative)	13m 23s
Test (ubuntu-22.04, 2.13, temurin@8, catsJVM)	9m 30s
Test (ubuntu-22.04, 2.13, graalvm@21, catsJVM)	5m 49s
Test (ubuntu-22.04, 2.12, temurin@8, catsNative)	12m 49s
Test (ubuntu-22.04, 3, temurin@8, catsJS)	11m 0s
Test (ubuntu-22.04, 2.13, temurin@17, catsJVM)	6m 22s
Test (ubuntu-22.04, 3, temurin@8, catsJVM)	10m 35s
Test (ubuntu-22.04, 3, temurin@8, catsNative)	15m 22s
Test (ubuntu-22.04, 2.12, temurin@8, catsJS)	9m 29s
Publish Artifacts	0s
	2h 4m 40s

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