Invalid project files break

[JuliaTagBot]

Repo: arnavs/HealthSimulations.jl
Run URL: https://github.com/arnavs/HealthSimulations.jl/actions/runs/45997280
Image ID: sha256:23e996c42a17dc7bd314e5d992cdec375a581bf6e2e49af9917aae167d328b3f
Stacktrace:

Traceback (most recent call last):
  File "/root/tagbot/action/__main__.py", line 48, in <module>
    versions = repo.new_versions()
  File "/root/tagbot/action/repo.py", line 186, in new_versions
    current = self._versions()
  File "/root/tagbot/action/repo.py", line 157, in _versions
    root = self._registry_path
  File "/root/tagbot/action/repo.py", line 77, in _registry_path
    uuid = self._project("uuid")
  File "/root/tagbot/action/repo.py", line 68, in _project
    return str(self.__project[k])
KeyError: 'uuid'

[err]

[JuliaTagBot]

Probably duplicate error:
Repo: oxinabox/ipynb2Literate.jl
Run URL: https://github.com/oxinabox/ipynb2Literate.jl/actions/runs/46001132
Image ID: sha256:23e996c42a17dc7bd314e5d992cdec375a581bf6e2e49af9917aae167d328b3f
Stacktrace:

Traceback (most recent call last):
  File "/root/tagbot/action/__main__.py", line 48, in <module>
    versions = repo.new_versions()
  File "/root/tagbot/action/repo.py", line 186, in new_versions
    current = self._versions()
  File "/root/tagbot/action/repo.py", line 157, in _versions
    root = self._registry_path
  File "/root/tagbot/action/repo.py", line 77, in _registry_path
    uuid = self._project("uuid")
  File "/root/tagbot/action/repo.py", line 68, in _project
    return str(self.__project[k])
KeyError: 'uuid'

[DilumAluthge]

@christopher-dG You should probably just skip if the Project.toml file has no uuid.

[christopher-dG]

Already done, see #3 (in the future these issues won't be opened more than once)