Wrongly displayed state of default policy in new icons

[MathRPG]

New icons appear in their configuration window to have a RoundRobin policy by default. However, if attempting to run a simulation, the user will encounter a Could not load policy '---'! error.

Two acceptable solutions:

• Display in the configuration window the 'no option' option again.
• Change the default state of newly created icons to use the RoundRobin policy (or whichever policy is default for their use case).