IndexError fixes + bool(Component) to return True #179
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Hi,
Found an IndexError in Component.from_ical() at https://github.com/collective/icalendar/blob/master/src/icalendar/cal.py#L350 so I replaced it with ValueError instead.
Also added bool() in Component so the instances of the class return True on bool() check (#141). Without it, the check at https://github.com/collective/icalendar/blob/master/src/icalendar/cal.py#L317 might always fail and raise Exception even for Components with ignore_exceptions == True.