[IntelliJ] Warning message should not include \n

[jingyanjingyan]

Build: Develop 894

Repro Steps:

1. Create a spark on cosmos config file, leave some area empty, save
2. Remote run

Result:
Warning message

Expect:
Should not include \n

[jingyanjingyan]

Verify with build develop 907
One kind of error message still have \n inside.

[wezhang]

I'll change it to only show the first error of list