fixed xunitwriter after removing suite.all_stats
fixed xunitwriter after removing suite.all_stats

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