Add test for rescue with safe navigator setter on nil #207

Job	Run time
RuboCop	24s
specs (ubuntu, 3.0.6)	1m 26s
specs (ubuntu, 3.1.4)	1m 32s
specs (ubuntu, 3.2.2)	1m 25s
specs (ubuntu, 3.3.0)	1m 30s
specs (macos, 3.0.6)	1m 20s
specs (macos, 3.1.4)	1m 27s
specs (macos, 3.2.2)	1m 20s
specs (macos, 3.3.0)	1m 10s
specs (windows, 3.0.6)	4m 14s
specs (windows, 3.1.4)	3m 52s
specs (windows, 3.2.2)	4m 39s
specs (windows, 3.3.0)	5m 2s
specs (ubuntu, 3.3.0, --enable-frozen-string-literal)	1m 21s
	30m 42s

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