pipdeptree -u fails to find any packages.


Reproducible: Always

Steps to Reproduce:
1. `pipdeptree -u`
Actual Results:  
No output at all

Expected Results:  
Warning!!! Possibly conflicting dependencies found:
* sickchill==2023.6.27
 - greenlet [required: >=2.0.0, installed: ?]
* SQLAlchemy==2.0.23
 - greenlet [required: !=0.4.17, installed: ?]
------------------------------------------------------------------------
anitya-schema==2.2.0
└── fedora-messaging [required: >=3.1.0,<4.0.0, installed: 3.4.1]
dogpile.cache==1.2.2
├── decorator [required: >=4.0.0, installed: 5.1.1]
└── stevedore [required: >=3.0.0, installed: 5.0.0]
pipdeptree==2.13.1
sickchill==2023.6.27
├── babelfish [required: >=0.6.0b1, installed: 0.6.0]
├── beekeeper-alt [required: >=2022.9.3, installed: 2022.9.3]
│   └── xmltodict [required: >=0.9.2, installed: 0.12.0]
├── bencode.py [required: >=4.0.0,<5.0.0, installed: 4.0.0]
├── cacheyou [required: >=23.2,<24.0, installed: 23.3]
│   ├── msgpack [required: >=0.5.2, installed: 1.0.5]
│   └── requests [required: Any, installed: 2.28.2]
├── configobj [required: >=5.0.6,<6.0.0, installed: 5.0.8]
├── deluge-client [required: >=1.9.0,<2.0.0, installed: 1.9.0]
├── enzyme [required: >=0.4.1,<0.5.0, installed: 0.4.1]
├── gntp [required: >=1.0.3,<2.0.0, installed: 1.0.3]
├── greenlet [required: >=2.0.0, installed: ?]
├── guessit [required: >=3.3.1,<4.0.0, installed: 3.7.1]
├── ifaddr [required: >=0.1.7,<0.3.0, installed: 0.1.7]
├── imagesize [required: >=1.2.0,<2.0.0, installed: 1.4.1]
├── IMDbPY [required: >=2020.09.25, installed: 2022.7.9]
│   └── cinemagoer [required: Any, installed: 2023.5.1]
│       ├── lxml [required: Any, installed: 4.9.3]
│       └── SQLAlchemy [required: Any, installed: 2.0.23]
│           ├── greenlet [required: !=0.4.17, installed: ?]
│           └── typing-extensions [required: >=4.2.0, installed: 4.8.0]
├── ipaddress [required: >=1.0.23,<2.0.0, installed: 1.0.23]
├── jsonrpclib-pelix [required: >=0.4.2,<0.5.0, installed: 0.4.3.2]
├── kodipydent-alt [required: >=2022.9.3, installed: 2022.9.3]
│   └── beekeeper-alt [required: >=2022.9.3,<2023.0.0, installed: 2022.9.3]
│       └── xmltodict [required: >=0.9.2, installed: 0.12.0]
├── Mako [required: >=1.1.4,<2.0.0, installed: 1.2.3]
├── markdown2 [required: >=2.4.0,<3.0.0, installed: 2.4.10]
├── new-rtorrent-python [required: >=1.0.1-alpha.0,<2.0.0, installed: 1.0.1a0]
│   ├── bencode.py [required: Any, installed: 4.0.0]
│   └── requests [required: Any, installed: 2.28.2]
├── packaging [required: >=20.9,<24.0, installed: 23.1]
├── profilehooks [required: >=1.12.0,<2.0.0, installed: 1.12.0]
├── putio.py [required: >=8.7.0,<9.0.0, installed: 8.7.0]
│   ├── requests [required: Any, installed: 2.28.2]
│   ├── six [required: Any, installed: 1.16.0]
│   └── tus.py [required: Any, installed: 1.3.4]
│       └── requests [required: Any, installed: 2.28.2]
├── PyGithub [required: >=1.54.1,<2.0.0, installed: 1.58.2]
├── PyNMA [required: >=1.0,<2.0, installed: 1.0]
├── pyOpenSSL [required: >=20.0.1,<24.0.0, installed: 23.2.0]
├── python-dateutil [required: >=2.8.1,<3.0.0, installed: 2.8.2]
├── python-slugify [required: >=4.0.1,<9.0.0, installed: 8.0.1]
│   └── text-unidecode [required: >=1.3, installed: 1.3]
├── python-twitter [required: >=3.5,<4.0, installed: 3.5]
│   ├── future [required: Any, installed: 0.18.3]
│   ├── requests [required: Any, installed: 2.28.2]
│   └── requests-oauthlib [required: Any, installed: 1.3.1]
├── python3-fanart [required: >=2.0.0,<3.0.0, installed: 2.0.0]
│   └── requests [required: Any, installed: 2.28.2]
├── qbittorrent-api [required: >=2021.3.18,<2024.0.0, installed: 2023.11.55]
│   ├── packaging [required: Any, installed: 23.1]
│   ├── requests [required: >=2.16.0, installed: 2.28.2]
│   └── urllib3 [required: >=1.24.2, installed: 1.26.18]
├── rarfile [required: >=4.0,<5.0, installed: 4.0]
├── requests [required: >=2.25.1,<3.0.0, installed: 2.28.2]
├── Send2Trash [required: >=1.5.0,<2.0.0, installed: 1.8.2]
├── SQLAlchemy [required: >=2.0.0,<3.0.0, installed: 2.0.23]
│   ├── greenlet [required: !=0.4.17, installed: ?]
│   └── typing-extensions [required: >=4.2.0, installed: 4.8.0]
├── subliminal [required: >=2.1.0,<3.0.0, installed: 2.1.0]
├── timeago [required: >=1.0.15,<2.0.0, installed: 1.0.16]
├── tmdbsimple [required: >=2.8.0,<3.0.0, installed: 2.9.1]
│   └── requests [required: Any, installed: 2.28.2]
├── tornado [required: >=6.1,<7.0, installed: 6.3.3]
├── tus.py [required: >=1.3.4,<2.0.0, installed: 1.3.4]
│   └── requests [required: Any, installed: 2.28.2]
├── tvdbsimple [required: >=1.0.6,<2.0.0, installed: 1.0.6]
│   └── requests [required: Any, installed: 2.28.2]
├── Unidecode [required: >=1.2.0,<2.0.0, installed: 1.3.4]
├── validators [required: >=0.18.2,<0.21.0, installed: 0.20.0]
└── win-inet-pton [required: >=1.1.0,<2.0.0, installed: 1.1.0]
voipms==0.2.5
└── requests [required: >=2.7.0, installed: 2.28.2]


The Expected Results output were from pipdeptree version 2.13.1, so it seems an upgrade to fix a bug, at least is necessary never mind that the packaged version is no longer even supported.