EasyBuild framework unit tests

do not attach PIPE file handle on STDIN of `run_shell_cmd` unless there are contents for it #5547

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Run time

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Job	Run time
setup	1s
build (3.6, Lmod-8.7.6)	29m 30s
build (3.6, modules-4.5.3)	16m 12s
build (3.6, modules-5.3.1)	14m 5s
build (3.7, Lmod-8.7.6)	29m 29s
build (3.8, Lmod-8.7.6)	28m 41s
build (3.9, Lmod-8.7.6)	31m 9s
build (3.10, Lmod-8.7.6)	27m 24s
build (3.11, Lmod-8.7.6)	26m 34s
build (3.12, Lmod-8.7.6)	28m 5s
build (3.13, Lmod-8.7.6)	25m 29s
build (3.6, Lmod-8.7.6, C)	30m 54s
	4h 47m 33s