[IntelliJ]Warning cannot find cluster when there is no main class, run livy interactive console

[jingyanjingyan]

Build: Develop 880

Repro Steps:

1. Make sure there is no config file
2. Open a scala file, run livy interactive console

Result:
Warning cannot find the target cluster

The config file include cluster but does not have main class actually

[jingyanjingyan]

Repro with develop 903

[jingyanjingyan]

Repro with develop 907