Fix 1592 empty source on error #4169

Job	Run time
build	3m 7s
test_when_cache_missing	0s
test_when_cache_present (0, 8, 637)	23m 52s
test_when_cache_present (1, 8, 637)	21m 30s
test_when_cache_present (2, 8, 637)	22m 34s
test_when_cache_present (3, 8, 637)	22m 42s
test_when_cache_present (4, 8, 637)	21m 26s
test_when_cache_present (5, 8, 637)	21m 13s
test_when_cache_present (6, 8, 637)	23m 55s
test_when_cache_present (7, 8, 637)	25m 36s
test_when_cache_present (8, 8, 637)	10m 30s
save_test_times_when_cache_missing	0s
save_test_times_when_cache_present	4s
	3h 16m 29s

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