For #8054 - Focus should not crash when search engines are restored. (#…

…8059)

(cherry picked from commit 63ba241)

Co-authored-by: iorgamgabriel <iorgamgabriel@yahoo.com>

app/src/main/java/org/mozilla/focus/search/RadioSearchEngineListPreference.kt

@@ -39,14 +39,14 @@ class RadioSearchEngineListPreference : SearchEngineListPreference, RadioGroup.O
     }
 
     override fun onCheckedChanged(group: RadioGroup, checkedId: Int) {
-        val selectedEngine = group.getChildAt(checkedId)
+        val selectedEngine = group.getChildAt(checkedId) ?: return
 
         // check if the corresponding button was pressed or a11y focused.
         val hasProperState = selectedEngine.isPressed || selectedEngine.isAccessibilityFocused
 
         /* onCheckedChanged is called intermittently before the search engine table is full, so we
            must check these conditions to prevent crashes and inconsistent states. */
-        if (group.childCount != searchEngines.count() || selectedEngine == null || !hasProperState) {
+        if (group.childCount != searchEngines.count() || !hasProperState) {
             return
         }