CI: Check that plmn_list matching key has dict type

The loop passes over all keys. For plmn_list, there are subentries mcc,
mnc, mnc_length. The plmn_list if block assumes that the key is a dict,
which was not checked for, leading to a type error.

docker/scripts/generateTemplate.py

@@ -105,7 +105,7 @@ def main():
                   templine = line
                 elif re.search(r'mnc_length', line) and key["key"] == "mnc":
                   continue
-                elif re.search(r'plmn_list', line):
+                elif re.search(r'plmn_list', line) and type(key["env"]) is dict:
                   templine = re.sub(r'[0-9]+', '""', line)
                   templine = re.sub(r'\"\"', key["env"]["mcc"], templine, 1)
                   templine = re.sub(r'\"\"', key["env"]["mnc"], templine, 1)