Possible fix for #914 compactCells failing when passed all res 1 cells #1474

Job	Run time
Coverage	3m 34s
Test Compile gcc Debug	3m 27s
Test Compile clang Debug	3m 25s
CMake correctness checks	7s
Test Compile gcc Release	2m 11s
Test Compile clang Release	2m 27s
Test Valgrind	11m 11s
Test Compile clang Debug -fsanitize=undefined,float-divide-by-zero -fno-sanitize-recover=undefined,float-divide-by-zero	6m 13s
Test Compile clang Release -fsanitize=undefined,float-divide-by-zero -fno-sanitize-recover=undefined,float-divide-by-zero	2m 54s
Test Compile clang Debug -fsanitize=memory -fno-sanitize-recover=memory	29m 27s
Test Compile clang Release -fsanitize=memory -fno-sanitize-recover=memory	5m 39s
Test Compile clang Debug -fsanitize=address -fno-sanitize-recover=address	5m 34s
Test Compile clang Release -fsanitize=address -fno-sanitize-recover=address	3m 14s
	1h 19m 23s

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