Fix 1592 empty source on error #4186

Job	Run time
build	2m 44s
test_when_cache_missing	0s
test_when_cache_present (0, 8, 650)	23m 39s
test_when_cache_present (1, 8, 650)	21m 0s
test_when_cache_present (2, 8, 650)	20m 52s
test_when_cache_present (3, 8, 650)	22m 21s
test_when_cache_present (4, 8, 650)	21m 8s
test_when_cache_present (5, 8, 650)	22m 13s
test_when_cache_present (6, 8, 650)	22m 32s
test_when_cache_present (7, 8, 650)	25m 0s
test_when_cache_present (8, 8, 650)	12m 25s
save_test_times_when_cache_missing	0s
save_test_times_when_cache_present	4s
	3h 13m 58s

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