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Added null/empty jQuery check & default top val #51
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Based on this error I get when running GitBook 3.2.2:
```
Uncaught TypeError: Cannot read property 'top' of undefined
at a (theme.js:formatted:5276)
at HTMLLIElement.<anonymous> (theme.js:formatted:5315)
at Function.each (theme.js:formatted:784)
at de.fn.init.each (theme.js:formatted:694)
at HTMLDivElement.l (theme.js:formatted:5313)
at HTMLDivElement.dispatch (theme.js:formatted:2468)
at HTMLDivElement.m.handle (theme.js:formatted:2400)
```
Accordingly, I've added
# A null check to the `while` loop of `getElementTopPosition`
# An empty jQuery element check to the `while` loop of `getElementTopPosition`
# Sensible defaults should the call to `$el.position().top` in `getElementTopPosition` fail
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Based on this error I get when running GitBook 3.2.2:
Accordingly, I've added
whileloop ofgetElementTopPositionwhileloop ofgetElementTopPosition$el.position().topingetElementTopPositionfail