Fix potential NPE when ActivityClientRecord is null

From user bugreport and base on Android R code

12-02 11:52:09.533 10148  2525  2525 E AndroidRuntime: FATAL EXCEPTION: main
12-02 11:52:09.533 10148  2525  2525 E AndroidRuntime: Process: com.kuaishou.nebula, PID: 2525
12-02 11:52:09.533 10148  2525  2525 E AndroidRuntime: java.lang.NullPointerException: Attempt to invoke virtual method 'int android.app.ActivityThread$ActivityClientRecord.getLifecycleState()' on a null object>
12-02 11:52:09.533 10148  2525  2525 E AndroidRuntime: at android.app.servertransaction.TransactionExecutorHelper.getClosestOfStates(TransactionExecutorHelper.java:166)
12-02 11:52:09.533 10148  2525  2525 E AndroidRuntime: at android.app.servertransaction.TransactionExecutorHelper.getClosestPreExecutionState(TransactionExecutorHelper.java:144)
12-02 11:52:09.533 10148  2525  2525 E AndroidRuntime: at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:129)
12-02 11:52:09.533 10148  2525  2525 E AndroidRuntime: at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:95)
12-02 11:52:09.533 10148  2525  2525 E AndroidRuntime: at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2105)

Bug: 262605168
Test: NA

Change-Id: I9613ddd569d6b3d0617b401c73a4f5b92cd95e2e
Signed-off-by: lihaizhou <lihaizhou@coolpad.com>