HPCC-32337 Don't color metrics with a std deviation == 0 #10131

Job	Run time
check-skip	6s
Build platform and regress setup	6m 11s
unittests	2m 30s
regression-jobs (hthor, [a-d]*.ecl)	5m 43s
eclwatch-ui-tests	1m 52s
regression-jobs (hthor, [e-h]*.ecl)	3m 17s
regression-jobs (hthor, [i-l]*.ecl)	4m 57s
regression-jobs (hthor, [m-q]*.ecl)	3m 30s
regression-jobs (hthor, [r-u]*.ecl, teststdlibrary.ecl)	9m 41s
regression-jobs (hthor, [v-z]*.ecl)	3m 52s
regression-jobs (thor, [a-d]*.ecl)	4m 47s
regression-jobs (thor, [e-h]*.ecl)	3m 23s
regression-jobs (thor, [i-l]*.ecl)	6m 27s
regression-jobs (thor, [m-q]*.ecl)	2m 59s
regression-jobs (thor, [r-u]*.ecl, teststdlibrary.ecl)	8m 37s
regression-jobs (thor, [v-z]*.ecl)	2m 43s
regression-jobs (roxie, [a-d]*.ecl)	6m 44s
regression-jobs (roxie, [e-h]*.ecl)	3m 37s
regression-jobs (roxie, [i-l]*.ecl)	5m 37s
regression-jobs (roxie, [m-q]*.ecl)	4m 43s
regression-jobs (roxie, [r-u]*.ecl, teststdlibrary.ecl)	10m 18s
regression-jobs (roxie, [v-z]*.ecl)	3m 46s
regression-jobs (hthor, teststdlibrary.ecl)	2m 38s
regression-jobs (thor, teststdlibrary.ecl)	3m 41s
regression-jobs (roxie, teststdlibrary.ecl)	3m 26s
	1h 55m 5s

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