Cannot update plugin via the UI

[oscarsiles]

Expected Behaviour

Plugin updates via UI by clicking the corresponding button.

Actual Behaviour

Plugin does not update. Tried to update the Language Picker plugin, but nothing was happening and no errors were showing in server log. Did some debugging and it should be throwing the error "There is a plugin already installed with a target attribute of '_languagePicker'." but isn't. From what I can tell, this was probably introduced in #2440 .

Steps to Reproduce

1. Update a plugin via the UI.

Versions

• Authoring Tool Version: 0.10.1
• Framework Version: 4.3.0
• Node.js Version: 12.13 LTS
• MongoDB Version: 4.0.12
• Operating System: Ubuntu
• Browser: Chrome