libs/utils/report: fix division error when energy data are not available
libs/utils/report: fix division error when energy data are not available

This patch allows to report tests data also when energy counters are not
used (i.e. hwmon module is disabled in the test configuration).

The generated table has the same structure but energy related columns
will report always a value of 0.

Signed-off-by: Patrick Bellasi <431c86f368affbc3148c4669fbd465131f7e82cb@arm.com>

bjackman/lisa,ARM-software/lisa,bjackman/lisa,credp/lisa,ARM-software/lisa,credp/lisa,joelagnel/lisa,arnoldlu/lisa,arnoldlu/lisa,credp/lisa,mdigiorgio/lisa,JaviMerino/lisa,ARM-software/lisa,mdigiorgio/lisa,joelagnel/lisa,ARM-software/lisa,credp/lisa