Fix error when including tutorials #51
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Adding check for existence of `ancestors` property before reading `length`. The `ancestors` property does not exist on tutorial items so the build breaks with the following error:
```
C:\dev\projects\stuff\node_modules\docdash\publish.js:335
if (item.ancestors.length > level) {
^
TypeError: Cannot read property 'length' of undefined
```
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Adding check for existence of
ancestorsproperty onitembefore readingancestors.length. Theancestorsproperty does not exist on tutorial items so the build breaks with the following error: