Michael Goderbauer dd68239b43 Don't crash on iOS if there is only a single SemanticsNode (#4128)
* Don't crash if there is only a single SemanticsNode

Previously, the code assumed that the root SemanticsNode will allways have a child. This is not true as can be seen in the hello_world example app, which would crash when a11y is turned on.

* review comment
2017-09-20 14:17:50 -07:00
2017-01-20 13:40:45 -08:00

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