Fix crash when error messages are triggered due to configuration changes.

Bug: 197265282
Test: Manaul (start enrollment and switch active display)
Change-Id: Id83ea58dc6b06461f48cddf90e85cc682ac2451c
diff --git a/src/com/android/settings/biometrics/fingerprint/FingerprintErrorDialog.java b/src/com/android/settings/biometrics/fingerprint/FingerprintErrorDialog.java
index fa92951..0fc8670 100644
--- a/src/com/android/settings/biometrics/fingerprint/FingerprintErrorDialog.java
+++ b/src/com/android/settings/biometrics/fingerprint/FingerprintErrorDialog.java
@@ -31,12 +31,18 @@
  */
 public class FingerprintErrorDialog extends BiometricErrorDialog {
     public static void showErrorDialog(BiometricEnrollBase host, int errMsgId) {
+        if (host.isFinishing()) {
+            return;
+        }
+
+        final FragmentManager fragmentManager = host.getSupportFragmentManager();
+        if (fragmentManager.isDestroyed()) {
+            return;
+        }
+
         final CharSequence errMsg = host.getText(getErrorMessage(errMsgId));
         final FingerprintErrorDialog dialog = newInstance(errMsg, errMsgId);
-        final FragmentManager fragmentManager = host.getSupportFragmentManager();
-        if (!fragmentManager.isDestroyed()) {
-            dialog.show(fragmentManager, FingerprintErrorDialog.class.getName());
-        }
+        dialog.show(fragmentManager, FingerprintErrorDialog.class.getName());
     }
 
     private static int getErrorMessage(int errMsgId) {