Comment 13 for bug 969873

Another idea:

1. Remove default amounts
2. Add a check to the editor which checks for some things and if the check fails, open a window showing what is missing.

E.g.: 'The map does not contain any fish/water/coal/gold/players/..'

The check can be executed automatically on map save, or with a new button 'Check playability' (maybe in the Save map dialogue).