Add wtf log if notification panel height is NaN

NotificationPanelViewController#getMaxPanelHeightNonBypass() is the one
place where we aren't explicitly checking for NaN where it could be
introduced into PanelViewController mExpandedFraction.

Test: manual
Bug: 160688163
Change-Id: I3e5047295085cd61c3ceebe456c6560b28f616f7

packages/SystemUI/src/com/android/systemui/statusbar/phone/NotificationPanelViewController.java

@@ -1998,8 +1998,8 @@ public class NotificationPanelViewController extends PanelViewController {
             maxHeight = calculatePanelHeightShade();
         }
         maxHeight = Math.max(min, maxHeight);
-        if (maxHeight == 0) {
-            Log.wtf(TAG, "maxPanelHeight is 0. getOverExpansionAmount(): "
+        if (maxHeight == 0 || isNaN(maxHeight)) {
+            Log.wtf(TAG, "maxPanelHeight is invalid. getOverExpansionAmount(): "
                     + getOverExpansionAmount() + ", calculatePanelHeightQsExpanded: "
                     + calculatePanelHeightQsExpanded() + ", calculatePanelHeightShade: "
                     + calculatePanelHeightShade() + ", mStatusBarMinHeight = "