Prevent crash

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

@@ -897,7 +897,10 @@ public class ActivityView extends ActivityBilling implements FragmentManager.OnB
         create.addCategory(Intent.CATEGORY_OPENABLE);
         create.setType(intent.getStringExtra("type"));
         create.putExtra(Intent.EXTRA_TITLE, intent.getStringExtra("name"));
-        startActivityForResult(create, REQUEST_ATTACHMENT);
+        if (create.resolveActivity(getPackageManager()) == null)
+            Snackbar.make(view, R.string.title_no_saf, Snackbar.LENGTH_LONG).show();
+        else
+            startActivityForResult(create, REQUEST_ATTACHMENT);
     }
 
     private void onDecrypt(Intent intent) {

app/src/main/res/values/strings.xml

@@ -195,6 +195,7 @@
 
     <string name="title_no_answers">No reply templates defined</string>
     <string name="title_no_viewer">No viewer app available for %1$s</string>
+    <string name="title_no_saf">Storage access framework not available</string>
     <string name="title_attachment_saved">Attachment saved</string>
     <string name="title_attachment_unavailable">Some attachments are not downloaded and will not be forwarded, continue?</string>
     <string name="title_ask_delete">Delete message permanently?</string>