Sheet: 411 "not and" -> "or"; substr -> slice
Sheet: 407: clean up array making OR unneeded
Sheet: Fix error with blur on empty cell

This commit effectively reverts 905110d378fe9201c541b573ca8b66b7ed1ce11c
The reason is when empty string (valid for cell) is passed to A(), it is
treated as falsy and defineProperty is invoked on non-configurable
property.
Merge pull request #2 from subzey/feature/golf

Sheet: 411 "not and" -> "or"; substr -> slice