Prevent NPE in QSLogger

This prevents an NPE that was crashing CTS tests.

Test: atest CtsAppTestCases:TileServiceTest
Test: atest BooleanTileTest
Fixes: 149475098
Fixes: 149476175
Change-Id: I806bfd881772f2e229d595aaf68f5e3782c51f6b

packages/SystemUI/src/com/android/systemui/qs/logging/QSLogger.kt

@@ -105,8 +105,8 @@ class QSLogger @Inject constructor(
     fun logTileUpdated(tileSpec: String, state: QSTile.State) {
         log(VERBOSE, {
             str1 = tileSpec
-            str2 = state.label.toString()
-            str3 = state.icon.toString()
+            str2 = state.label?.toString()
+            str3 = state.icon?.toString()
             int1 = state.state
             if (state is QSTile.SignalState) {
                 bool1 = true