NullPointerException from AccountManagerUtil.java

[jiayle27]

Issue
Telemetry shows MSAL related crash for extremely small size of users (0.0006% total users) but high hit rate for these impacted users. All affected OS is Android 11, devices are mostly Pixel 5.

Crash
com.microsoft.identity.common.internal.util.AccountManagerUtil.canUseAccountManagerOperation
AccountManagerUtil.java, line 62
java.lang.NullPointerException: Attempt to get length of null array

Version
commonVersion=3.6.2
msalVersion=2.2.1

Stack traces
com.microsoft.identity.common.internal.util.AccountManagerUtil.canUseAccountManagerOperation AccountManagerUtil.java:62
com.microsoft.identity.common.internal.controllers.BrokerMsalController.getIpcStrategies BrokerMsalController.java:160
com.microsoft.identity.common.internal.controllers.BrokerMsalController. BrokerMsalController.java:124
com.microsoft.identity.client.internal.controllers.MSALControllerFactory.getDefaultController MSALControllerFactory.java:73
com.microsoft.identity.client.PublicClientApplication.create PublicClientApplication.java:917
com.microsoft.identity.client.PublicClientApplication.createMultipleAccountPublicClientApplication PublicClientApplication.java:980
com.microsoft.identity.client.PublicClientApplication.access$100 PublicClientApplication.java:202
com.microsoft.identity.client.PublicClientApplication$4.run PublicClientApplication.java:458
java.lang.Thread.run Thread.java:923

[AdamBJohnsonx]

https://developer.android.com/reference/android/app/admin/DevicePolicyManager#getAccountTypesWithManagementDisabled()

This is a bug. The api may return null, and we're not checking for it here:

microsoft-authentication-library-common-for-android/common/src/main/java/com/microsoft/identity/common/internal/util/AccountManagerUtil.java

Line 64 in 86e3aea

for (final String accountType : devicePolicyManager.getAccountTypesWithManagementDisabled()) {