EasyBuild framework unit tests

do not attach PIPE file handle on STDIN of `run_shell_cmd` unless there are contents for it #5546

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Run time

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Job	Run time
setup	2s
build (3.6, Lmod-8.7.6)	29m 56s
build (3.6, modules-4.5.3)	19m 22s
build (3.6, modules-5.3.1)	14m 35s
build (3.7, Lmod-8.7.6)	30m 1s
build (3.8, Lmod-8.7.6)	30m 3s
build (3.9, Lmod-8.7.6)	30m 0s
build (3.10, Lmod-8.7.6)	28m 22s
build (3.11, Lmod-8.7.6)	25m 50s
build (3.12, Lmod-8.7.6)	26m 22s
build (3.13, Lmod-8.7.6)	25m 59s
build (3.6, Lmod-8.7.6, C)	30m 4s
	4h 50m 36s