Telecom:fix NPE problem in the CallSManager java file.

   The parameter phoneAccountHandle come from the getTargetPhoneAccount
  method,but the return val may be null.

Test:Manual
Bug: 340310281
Change-Id: I38c5473450b58c464213b53c0bce9270bdac7e47
diff --git a/src/com/android/server/telecom/CallsManager.java b/src/com/android/server/telecom/CallsManager.java
index b04e9fa..9ac3837 100755
--- a/src/com/android/server/telecom/CallsManager.java
+++ b/src/com/android/server/telecom/CallsManager.java
@@ -4850,6 +4850,7 @@
                 // change what an "active call" is so that the call in SELECT_PHONE_ACCOUNT state
                 // will be properly cancelled.
                 call.getTargetPhoneAccount() != null
+                        && phoneAccountHandle != null
                         && !phoneAccountHandle.getComponentName().equals(
                                 call.getTargetPhoneAccount().getComponentName())
                         && call.getParentCall() == null