[jsk_perception] Catch exception when dynamodb doesn't have entry that matches FaceID

[tkmtnt7000]

This PR avoids the following error.
This error occurs when dynamodb entry of face images does not exists for some reasons such as mistakenly deleting it.

...
[INFO] [1688613945.445521] [/aws_auto_checkin_app]: [[{'Similarity': 96.03959655761719, 'Face': {'FaceId': '2411ca49-43cf-4495-8da6-0e0f9212f1c8', 'BoundingBox': {'Width': 0.1941870003938675, 'Height': 0.3191249966621399, 'Left': 0.4040130078792572, 'Top': 0.25807899236679077}, 'ImageId': '532947df-2b6c-37cd-9b13-68a14501cbdf', 'Confidence': 99.99559783935547}}]]
[ERROR] [1688613945.560723] [/aws_auto_checkin_app]: [bad callback: <bound method Subscriber.callback of <message_filters.Subscriber object at 0x7f09d96fe280>>
Traceback (most recent call last):
  File "/opt/ros/noetic/lib/python3/dist-packages/rospy/topics.py", line 750, in _invoke_callback
    cb(msg)
  File "/opt/ros/noetic/lib/python3/dist-packages/message_filters/__init__.py", line 76, in callback
    self.signalMessage(msg)
  File "/opt/ros/noetic/lib/python3/dist-packages/message_filters/__init__.py", line 58, in signalMessage
    cb(*(msg + args))
  File "/opt/ros/noetic/lib/python3/dist-packages/message_filters/__init__.py", line 330, in add
    self.signalMessage(*msgs)
  File "/opt/ros/noetic/lib/python3/dist-packages/message_filters/__init__.py", line 58, in signalMessage
    cb(*(msg + args))
  File "/home/tsukamoto/ros/robot_ws/src/jsk_recognition/jsk_perception/node_scripts/aws_auto_checkin_app.py", line 194, in callback
    face_id = self.dynamodb_table.get_item(
KeyError: 'Item'
]

[mqcmd196]

@tkmtnt7000 Sorry, the PR title of #2766 is quite confusing but it tries to solve same trouble

[tkmtnt7000]

Oh, thank you. Move to #2766.

[k-okada]

closed via @mqcmd196 's commit #2766