JsonRefError: Unresolvable JSON pointer: '/definitions/MilestoneReference'

[sentry-io]

If a user uploads a schema with unresolvable JSON pointers, then the app will error. We can add error handling for the `get_mapping_sheet_from_* methods.

Sentry Issue: OPEN-CONTRACTING-TOUCAN-W

AttributeError: 'JsonRef' object has no attribute 'cache'
  File "proxytypes.py", line 252, in __subject__
    return self.cache
  File "proxytypes.py", line 176, in __getattribute__
    return _oga(self, attr)

KeyError: 'MilestoneReference'
  File "jsonref.py", line 217, in resolve_pointer
    document = document[part]

JsonRefError: Unresolvable JSON pointer: '/definitions/MilestoneReference'
(20 additional frame(s) were not displayed)
...
  File "jsonref.py", line 174, in callback
    result = self.resolve_pointer(self.store[uri], fragment)
  File "proxytypes.py", line 134, in wrapper
    return method(self, *args, **kwargs)
  File "jsonref.py", line 219, in resolve_pointer
    self._error("Unresolvable JSON pointer: %r" % pointer, cause=e)
  File "proxytypes.py", line 134, in wrapper
    return method(self, *args, **kwargs)
  File "jsonref.py", line 229, in _error
    cause=cause,

[sentry-io]

Sentry issue: OPEN-CONTRACTING-TOUCAN-X