This is a minor patch with the following game crash fixes:
- Level 'Convoy' blocker - Uncaught TypeError: Cannot use 'in' operator to search for 'spawn-rate-percent' in 5 (thanks to juan ignacio)
- Custom levels with no builder units - Uncaught TypeError: Cannot read property 'onMatterChange' of undefined
- Rare Experiments bug - Uncaught TypeError: Cannot read property 'wavesGrp' of null (kudos to Kubla Khan)
- Rare Level Editor issue - Uncaught TypeError: Cannot read property 'properties' of null
We also added some annoying help tips in Level Editor.