Ignore crash/bug in Android

app/src/main/java/eu/faircode/email/Log.java

@@ -917,6 +917,22 @@ public class Log {
              */
             return false;
 
+        if (ex instanceof NullPointerException &&
+                stack.length > 0 &&
+                "android.app.ActivityThread".equals(stack[0].getClassName()) &&
+                "handleStopActivity".equals(stack[0].getMethodName()))
+            /*
+                Android: 6.0.1
+                java.lang.NullPointerException: Attempt to read from field 'android.app.Activity android.app.ActivityThread$ActivityClientRecord.activity' on a null object reference
+                  at android.app.ActivityThread.handleStopActivity(ActivityThread.java:4766)
+                  at android.app.ActivityThread.access$1400(ActivityThread.java:221)
+                  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1823)
+                  at android.os.Handler.dispatchMessage(Handler.java:102)
+                  at android.os.Looper.loop(Looper.java:158)
+                  at android.app.ActivityThread.main(ActivityThread.java:7224)
+             */
+            return false;
+
         if (ex instanceof IndexOutOfBoundsException &&
                 stack.length > 0 &&
                 "android.text.SpannableStringInternal".equals(stack[0].getClassName()) &&