work_units_fh is iterable on lines (could actually be ['{}',...])

def _read_work_units_file(self, work_units_fh):
        '''work_units_fh is iterable on lines (could actually be ['{}',...])
        '''
        count = 0
        for line in work_units_fh:
            if not line:
                continue
            line = line.strip()
            if not line:
                continue
            if line[0] == '#':
                continue
            try:
                count += 1
                work_unit = json.loads(line)
                #work_units.update(work_unit)
                for k,v in work_unit.iteritems():
                    yield k,v
            except:
                logger.error('failed handling work_unit on line %s: %r', count, line, exc_info=True)
                raise