What steps will reproduce the problem? 1. Create an action 2. Specify no precondition or a expression that is not translated by itSIMPLE to PDDL 3. The translated PDDL is going to have a empty precondition and this seems to be a syntax error.

What is the expected output? What do you see instead? An PDDL with no :precondition section in the given action

What version of the product are you using? On what operating system? itSIMPLE verion: 3.0 operating system: all

Please provide any additional information below.