fix(scroll): prevent 'cannot read from undefined' exception

[leobetosouza]

Sometimes, I don't know why yet, scrollView is undefined and this line rises an Error. This commit fix this problem, but don't fix what makes the scrollView undefined.

[mhartington]

Do you have an example of some markup where you'll get this error? Your change just adds a double check to make sure there is scroll view, but its not clear why that wouldn't be covered by the original

[leobetosouza]

I'm sorry. But I don't have a specific snippet that generates this error.

I get it in Android 6.0 with chromium 44, using JS Scrolling at the startup. When I switched to native none of my test devices get the error.

I've tried to read the code on ionic.views.Scroll() but (at this moment) understand it is beyond my capabilities.

[igor-slotin]

+1
I have same issue, and this pull-request fixed it
It happened if data load in controller longer than rendering template

[leobetosouza]

@igor-slotin @audotto @iltaen @bambriy @GulinSS do you have some code example to share with us?

[mlynch]

Thanks, seems like a harmless check to add