Part 4: Make sure 'sync is on' snackbar does not initialize account manager

app/src/main/java/org/mozilla/fenix/home/HomeFragment.kt

@@ -391,7 +391,12 @@ class HomeFragment : Fragment() {
             )
         )
 
-        requireComponents.backgroundServices.accountManager.register(currentMode, owner = this)
+        requireComponents.backgroundServices.accountManagerAvailableQueue.runIfReadyOrQueue {
+            // By the time this code runs, we may not be attached to a context.
+            if ((this@HomeFragment).context == null) {
+                return@runIfReadyOrQueue
+            }
+            requireComponents.backgroundServices.accountManager.register(currentMode, owner = this@HomeFragment)
             requireComponents.backgroundServices.accountManager.register(object : AccountObserver {
                 override fun onAuthenticated(account: OAuthAccount, authType: AuthType) {
                     if (authType != AuthType.Existing) {
@@ -403,7 +408,8 @@ class HomeFragment : Fragment() {
                         }
                     }
                 }
-        }, owner = this)
+            }, owner = this@HomeFragment)
+        }
 
         if (context.settings().showPrivateModeContextualFeatureRecommender &&
             browsingModeManager.mode.isPrivate