Add null check for slot to avoid phone process crashes.

Bug: 80299566
Test: test on phone
Change-Id: I06aec4ed1e1009a5efe219545799d45ca7ab6726
diff --git a/src/com/android/phone/PhoneInterfaceManager.java b/src/com/android/phone/PhoneInterfaceManager.java
index 613d160..ae3ec4e 100755
--- a/src/com/android/phone/PhoneInterfaceManager.java
+++ b/src/com/android/phone/PhoneInterfaceManager.java
@@ -4211,6 +4211,9 @@
         UiccSlotInfo[] infos = new UiccSlotInfo[slots.length];
         for (int i = 0; i < slots.length; i++) {
             UiccSlot slot = slots[i];
+            if (slot == null) {
+                continue;
+            }
 
             String cardId;
             UiccCard card = slot.getUiccCard();