Pyrevit: Pre Flight Check - Model Check "'Chart' is undefined"

[DuncanLithgow]

Describe the bug
Script error message on running the Pre Flight Check - Model Check

To Reproduce
Steps to reproduce the behavior:

1. Just run the tool

Expected behavior
Should run without errors

Screenshots

Desktop (please complete the following information):

• OS: Windows10
• pyRevit Version 4.5.8
• pyRevit Environment: Open a command prompt and run the command below. Replace these lines with the results. Take a look at this markdown guide and wrap the command results in ``` when pasting here for correct formatting.

pyrevit env

```Microsoft Windows [Version 10.0.17763.1757]
(c) 2018 Microsoft Corporation. All rights reserved.

C:\Users\dli>pyrevit env
==> Registered Clones (full git repos)
==> Registered Clones (deployed from archive/image)
master | Deploy: "basepublic" | Branch: "master" | Version: "4.8.5" | Path: "C:\Users\dli\AppData\Roaming\pyRevit-Master"
==> Attachments
master | Product: "2021.1.1" | Engine: IPY277 (277) | Path: "C:\Users\dli\AppData\Roaming\pyRevit-Master"
master | Product: "2020.2.3" | Engine: IPY277 (277) | Path: "C:\Users\dli\AppData\Roaming\pyRevit-Master"
master | Product: "2019.2.2 Hotfix" | Engine: IPY277 (277) | Path: "C:\Users\dli\AppData\Roaming\pyRevit-Master"
master | Product: "2018.3.3 Security Fix" | Engine: IPY277 (277) | Path: "C:\Users\dli\AppData\Roaming\pyRevit-Master"
master | Product: "2017.2.5 Security Fix" | Engine: IPY277 (277) | Path: "C:\Users\dli\AppData\Roaming\pyRevit-Master"
==> Installed Extensions
==> Default Extension Search Path
C:\Users\dli\AppData\Roaming\pyRevit\Extensions
==> Extension Search Paths
==> Extension Sources - Default
https://github.com/eirannejad/pyRevit/raw/master/extensions/extensions.json
==> Extension Sources - Additional
==> Installed Revits
2021.1.1 | Version: 21.1.10.26 | Build: 20200909_1515(x64) | Language: 1033 | Path: "C:\Program Files\Autodesk\Revit 2021\"
2020.2.3 | Version: 20.2.30.42 | Build: 20200826_1250(x64) | Language: 1033 | Path: "C:\Program Files\Autodesk\Revit 2020\"
2019.2.2 Hotfix | Version: 19.2.20.24 | Build: 20190808_0900(x64) | Language: 1033 | Path: "C:\Program Files\Autodesk\Revit 2019\"
2018.3.3 Security Fix | Version: 18.3.3.18 | Build: 20190510_1515(x64) | Language: 1033 | Path: "C:\Program Files\Autodesk\Revit 2018\"
2017.2.5 Security Fix | Version: 17.0.1169.0 | Build: 20190508_0315(x64) | Language: 1033 | Path: "C:\Program Files\Autodesk\Revit 2017\"
==> Running Revit Instances
PID: 9452 | 2019.2.2 Hotfix | Version: 19.2.20.24 | Build: 20190808_0900(x64) | Language: 0 | Path: "C:\Program Files\Autodesk\Revit 2019"
==> User Environment
Microsoft Windows 10 [Version 10.0.17763]
Executing User: RAMBOLL\DLI
Active User: RAMBOLL\DLI
Admin Access: No
%APPDATA%: "C:\Users\dli\AppData\Roaming"
Latest Installed .Net Framework: 4.8
No .Net Target Packs are installed.
No .Ne-Core Target Packs are installed.
pyRevit CLI 4.8.5.0

C:\Users\dli>```

Additional context
nul

[eirannejad]

Hmm this has got something to do with the output window not being able to download charts.js Let me see if I can include it with pyRevit and be done with this

[eirannejad]

Fixed and will be published with next release