Khan/khan-exercises — pull request #44625 by wwwtyro (2013-04-13 12:07:38+00:00)
Title: "fix" for utils/expressions/"^" rule not displaying zero exponent expressions

It's currently not possible to express expressions with zero exponents:

```
expr(["^", "a", 0])
```

results in "". I suppose I could put the zero in quotes, but that doesn't help with variables, right?

It seems clear that the "if pow === 0" check was put in there for a reason, so I'm fairly confident that my "fix" is in conflict with something else (hence the quotes).