[Addressables] "ActivePlayerDataBuilderIndex" value is changed, instead of "ActivePlayModeDataBuilderIndex" and no NULL check for "ActivePlayModeDataBuilder"

Reproduction steps:

1. Open "MinimalRepro" project
2. Search for and open in VS "AddressableAssetSettings.cs" in the Packages Folder
3. In line 687, instead of "ActivePlayModeDataBuilderIndex" value being changed, "ActivePlayerDataBuilderIndex" value is changed
4. In line 686 "ActivePlayModeDataBuilder" doesn't have a NULL check

Expected Result: Proper value to be changed and a NULL check to be present
Actual Result: Wrong value is changed and no NULL check is present

Reproduced with: 2019.2.0a1, 2019.1.0a14, 2018.3.3f1
Did not reproduce on: 2017.4.19f1 (No pacman)