abs-lang / abs / 1594

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Fixd an edge case with silent returns

Silent returns (`return`) wren't working, and were not covered by
exhaustive tests.

This PR fixes them and adds some mor sophisticated tests. A `return`
without a value, when interpretd before this PR, would terminate
the script without executing the rest of the code.

This snippet:

```
if false {
	return
}
return 3
```

would return `NULL` instead of `3`.

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