Handle answer security

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

@@ -332,6 +332,15 @@ public class FragmentAnswer extends FragmentBase {
             ssb.setSpan(is, start + 1, start + 2, Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);
             etText.setText(ssb);
             etText.setSelection(start + 2);
+        } catch (SecurityException ex) {
+            Snackbar sb = Snackbar.make(view, R.string.title_no_stream, Snackbar.LENGTH_INDEFINITE);
+            sb.setAction(R.string.title_info, new View.OnClickListener() {
+                @Override
+                public void onClick(View v) {
+                    Helper.viewFAQ(getContext(), 49);
+                }
+            });
+            sb.show();
         } catch (Throwable ex) {
             Log.unexpectedError(getParentFragmentManager(), ex);
         }