fix dialog activity leaked bug

Author: biodunalfet

raveandroid/src/main/java/com/flutterwave/raveandroid/account/AccountFragment.java

@@ -341,6 +341,9 @@ public void onBankSelected(Bank b) {
 
     @Override
     public void showProgressIndicator(boolean active) {
+
+        if (getActivity().isFinishing()) { return; }
+
         if (progessDialog == null) {
             progessDialog = new ProgressDialog(getActivity());
             progessDialog.setMessage("Please wait...");

raveandroid/src/main/java/com/flutterwave/raveandroid/card/CardFragment.java

@@ -390,6 +390,8 @@ private void clearErrors() {
      */
     @Override
     public void showProgressIndicator(boolean active) {
+
+        if (getActivity().isFinishing()) { return; }
         if(progessDialog == null) {
             progessDialog = new ProgressDialog(getActivity());
             progessDialog.setMessage("Please wait...");