[api] Setting global objects to NULL on teardown

src/address_dictionary.c

@@ -546,4 +546,5 @@ void address_dictionary_module_teardown(void) {
     if (address_dict != NULL) {
         address_dictionary_destroy(address_dict);
     }
+    address_dict = NULL;
 }

src/transliterate.c

@@ -1919,5 +1919,6 @@ bool transliteration_module_setup(char *filename) {
 
 void transliteration_module_teardown(void) {
     transliteration_table_destroy();
+    trans_table = NULL;
 }