Initialization fails on Android 7 Instant App

[chihweil5]

Describe the bug
Hi, there seems to be an Android framework issue when building instant app on Android 7 where Truskit fails to initialize.
After debugging, the root cause is coming from parsing the ApplicationInfo in this [method].(https://github.com/datatheorem/TrustKit-Android/blob/master/trustkit/src/main/java/com/datatheorem/android/trustkit/TrustKit.java#L231)
When building instant app project, Android 7 somehow fails to create networkSecurityConfigRes=0x. This doesn't happen on the traditional app.

To Reproduce
Here is the branch of a sample instant app modules:
https://github.com/chihweil5/TrustKit-Android/tree/instant-app

The quick tryout solution I made is by changing this condition here, both instant app and app are working on Android 7. I am not sure if this is a proper fix although. Thanks in advance for looking into this issue!

App details:

• App target SDK: [e.g. 24]
• App language: [e.g. Kotlin]
• Android version to reproduce the bug [e.g. Android N]

Thank you!