[BUG] Message.photo is set to an empty list when not provided

### Steps to reproduce
1. Generate a Message object without photo set.

2. Check the photo parameter


### Expected behaviour
.photo should be None

### Actual behaviour
.photo is an empty list


Wrong line: https://github.com/python-telegram-bot/python-telegram-bot/blob/1fdaaac8094c9d76c34c8c8e8c9add16080e75e7/telegram/message.py#L515

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[BUG] Message.photo is set to an empty list when not provided #2606

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[BUG] Message.photo is set to an empty list when not provided #2606

Description

Steps to reproduce

Expected behaviour

Actual behaviour

Metadata

Metadata

Assignees

Labels

Type

Projects

Milestone

Relationships

Development

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