improve valid sites robustness

Author: philimon-reset

l10n_CM/region/CA.json

@@ -5,7 +5,7 @@
     "walmart",
     "demo",
     "etsy",
-    "newbalance"
+    "newbalance",
     "ebay"
   ],
   "tests": [

l10n_CM/region/DE.json

@@ -1,7 +1,6 @@
 {
   "region": "DE",
   "sites": [
-
     "amazon",
     "mediamarkt",
     "demo"

l10n_CM/run_l10n.py

@@ -9,6 +9,8 @@
 
 import requests
 
+from check_l10n_test_cases import valid_l10n_mappings
+
 current_dir = os.path.dirname(__file__)
 valid_flags = {"--run-headless", "-n", "--reruns", "--fx-executable", "--ci"}
 flag_with_parameter = {"-n", "--reruns"}
@@ -30,6 +32,8 @@
     "zalando",
     "aldoshoes",
 }
+loaded_valid_sites = valid_l10n_mappings().keys()
+valid_sites = valid_sites.union(set(loaded_valid_sites))
 live_sites = []
 
 LOCALHOST = "127.0.0.1"