quick fix for assert description (#147)

Author: sseliverstov

allure-behave/src/utils.py

@@ -87,7 +87,7 @@ def step_status(result):
 
 def step_status_details(result):
     if result.exception:
-        message = u','.join(map(represent, result.exception.args))
+        message = u','.join(map(lambda s: u'%s' % s, result.exception.args))
         message = u'{name}: {message}'.format(name=result.exception.__class__.__name__, message=message)
         trace = u'\n'.join(traceback.format_tb(result.exc_traceback)) if result.exc_traceback else None
         return StatusDetails(message=message, trace=trace)