If tasks.json file contains a task of non-che type (e.g. shell), it can't be launched.

Steps to reproduce

1. Start a workspace with the Che-Code editor.
2. Run any non-che task defined in the tasks.json file.

Test tasks.json can be created with Terminal > Configure Tasks... > Create tasks.json file from template > maven.

Terminal panel is open, but the task is not run.