bugfix for bfacefactors #549

Job	Run time
Documentation	18m 31s
Julia 1.6 - ubuntu-latest - x64 - push	28m 2s
Julia 1.6 - macos-latest - x64 - push	37m 32s
Julia 1.6 - windows-latest - x64 - push	35m 59s
Julia 1 - ubuntu-latest - x64 - push	15m 37s
Julia 1 - macos-latest - x64 - push	25m 58s
Julia 1 - windows-latest - x64 - push	21m 6s
Julia nightly - ubuntu-latest - x64 - push	22m 18s
Julia nightly - macos-latest - x64 - push	42m 9s
Julia nightly - windows-latest - x64 - push	26m 49s
	4h 34m 1s

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