Prevent crash

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

@@ -326,6 +326,7 @@ public class FragmentOptionsMisc extends FragmentBase implements SharedPreferenc
                 try {
                     getContext().startActivity(app);
                 } catch (Throwable ex) {
+                    Log.w(ex);
                     ToastEx.makeText(getContext(), getString(R.string.title_no_viewer, app), Toast.LENGTH_LONG).show();
                 }
             }