Badly formatted json configuration file hangs the IDE

[BlueInt32]

Steps to reproduce

• Install Csharpier extension in Visual Studio (Community) or Jetbrains Rider on Windows 10
• create the following configuration in the expected json file (both .csharpierrc or .csharpierrc.json will reproduce) but with a wrong format, i.e. notice the double quotes missing for properties:

{
    printWidth: 120,
    useTabs: false,
    tabWidth: 4
}

• Set up csharpier to run on save
• Save any file (triggers the formatting)

Expected
The formatting does not work, something tells us that the configuration file is badly formatted.

Actual
The IDE (either VS or Rider) completely hangs, nothing can be done except:

• fixing the file (which un-hangs the IDE immediately)
• killing the IDE in the task manager

[belav]

I believe I fixed this problem in #1191, when the cli was throwing an exception the plugins would hang because the cli didn't send back a response indicating it was done trying to format.