KeyError raised when Subject ID is not a URI

[Ennovate-com]

In valid.py, the line:
subjects = value if isinstance(value, list) else [value]
converts a single value to a single-element list in subjects, which ensures that subjects will always be a list. However, later on, value is treated as a dictionary rather than a list:
uri_validator(value["id"])

And in another place, it is treated as a list subscripted with the integer 0:
f"credential subject id {value[0]} must be URI"'
In this case, if value is not a list, a KeyError 0 error is raised.

Once subjects has been assigned and is known to be a list, using the subject makes more sense than continuing to use the value having an ambiguous type.

2023-09-10 03:31:33,181 aries_cloudagent.admin.server ERROR Handler error with exception: 0
=================
Traceback (most recent call last):
  File "/aries_cloudagent/messaging/valid.py", line 753, in __call__
    uri_validator(value["id"])
  File "/usr/local/lib/python3.9/site-packages/marshmallow/validate.py", line 499, in __call__
    raise ValidationError(self._format_error(value))
marshmallow.exceptions.ValidationError: Value 123-45-6789_Dating is not URI

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  ...
  File "/aries_cloudagent/messaging/valid.py", line 756, in __call__
    f"credential subject id {value[0]} must be URI"
KeyError: 0
2023-09-10 03:31:33,183 aiohttp.server ERROR Error handling request
Traceback (most recent call last):
  File "/aries_cloudagent/messaging/valid.py", line 753, in __call__
    uri_validator(value["id"])
  File "/usr/local/lib/python3.9/site-packages/marshmallow/validate.py", line 499, in __call__
    raise ValidationError(self._format_error(value))
marshmallow.exceptions.ValidationError: Value 123-45-6789_Dating is not URI

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  ...
  File "/aries_cloudagent/messaging/valid.py", line 756, in __call__
    f"credential subject id {value[0]} must be URI"
KeyError: 0

[Ennovate-com]

Fixed in PR #2490

[dbluhm]

Fixed!