show start/end time in report summary only when it's not N/A (matches 2.5 behavior)
show start/end time in report summary only when it's not N/A (matches 2.5 behavior)

Senseg/robotframework,userzimmermann/robotframework-python3,Senseg/robotframework,userzimmermann/robotframework-python3,userzimmermann/robotframework-python3,Senseg/robotframework,userzimmermann/robotframework-python3,userzimmermann/robotframework-python3,Senseg/robotframework,Senseg/robotframework