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https://issues.apache.org/jira/browse/NIFI-6160?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16825493#comment-16825493
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ASF subversion and git services commented on NIFI-6160:
-------------------------------------------------------

Commit 31463c5dad38be0dcb5f8872c4b423f1f01cc786 in nifi's branch 
refs/heads/master from Koji Kawamura
[ https://gitbox.apache.org/repos/asf?p=nifi.git;h=31463c5 ]

NIFI-6160 Apply config error handling convention

What this PR changed:
- Standardized required name error message to 'The name of the xxxx must
be specified'
- Added nfErrorHandler.handleConfigurationUpdateAjaxError
    - Replaced existing custom error handling for 400 status code
    - Replaced handleAjxError with this where appropriate
- Standardized config error dialog title to 'Configuration Error'
- Close the configuration dialog when configuration is successfully
updated

Above convention applied to following components:
- ProcessGroup
- Input/OutputPort
- RemoteProcessGroup
    - RemoteGroupPort
- Template
- Connection
- ControllerService
- Label
- Processor
- ReportingTask
- NiFi Settings/GENERAL tab
- Variable
- User

NIFI-6170 Provide consistent UX at Connection config
Fixed Label.

Incorporated review comments
Removed unnecessary else block.
Disable canvas when the message pane is shown

This closes #3401


> During process group creation, if no name is provided, improve error pop-up 
> and do not close creation window
> ------------------------------------------------------------------------------------------------------------
>
>                 Key: NIFI-6160
>                 URL: https://issues.apache.org/jira/browse/NIFI-6160
>             Project: Apache NiFi
>          Issue Type: Improvement
>          Components: Core UI
>            Reporter: Andrew Lim
>            Assignee: Koji Kawamura
>            Priority: Minor
>          Time Spent: 2h 50m
>  Remaining Estimate: 0h
>
> When creating a Process group and providing no name, a pop-up appears with 
> the title "Create Process Group" with the message "The group name is 
> required." Selecting OK returns the user to the canvas.  User has to drag a 
> PG again onto the canvas to resume the process.
> It should be more like RPG creation.  During RPG creation, if no name is 
> provided a pop-up with the title "Configuration Error" is shown with the 
> message "The URI of the process group must be specified."  Selecting OK 
> returns the user to the Add Remote Process Group window.  This is a good UX.
> So applying this to process group creation.  If no name is supplied:
>  * open a pop-up with the title "Configuration Error"
>  * the message should say "The name of the process group must be specified."
>  * Selecting OK returns the user to the "Add Process Group" window



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