@@ -791,7 +791,7 @@ def _move_item(source_usage_key, target_parent_usage_key, user, target_index=Non
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else:
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try:
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target_index = int(target_index) if target_index is not None else None
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if len(target_parent.children) < target_index:
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if target_index is not None and len(target_parent.children) < target_index:
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error = _(u'You can not move {source_usage_key} at an invalid index ({target_index}).').format(
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source_usage_key=text_type(source_usage_key),
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target_index=target_index
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