Fix DROP DICTIONARY IF EXISTS db.dict - now it doesn't throw exceptions

even if db doesn't exist.

dbms/src/Interpreters/InterpreterDropQuery.cpp

@@ -164,7 +164,7 @@ BlockIO InterpreterDropQuery::executeToDictionary(
 
     auto ddl_guard = (!no_ddl_lock ? context.getDDLGuard(database_name, dictionary_name) : nullptr);
 
-    DatabasePtr database = tryGetDatabase(database_name, false);
+    DatabasePtr database = tryGetDatabase(database_name, if_exists);
 
     if (!database || !database->isDictionaryExist(context, dictionary_name))
     {

dbms/tests/queries/0_stateless/01041_create_dictionary_if_not_exists.sql

+DROP TABLE IF EXISTS dictdb.table_for_dict;
+DROP DICTIONARY IF EXISTS dictdb.dict_exists;
 DROP DATABASE IF EXISTS dictdb;
 
 CREATE DATABASE dictdb ENGINE = Ordinary;
@@ -37,4 +39,6 @@ LAYOUT(FLAT());
 
 SELECT dictGetFloat64('dictdb.dict_exists', 'value', toUInt64(1));
 
-DROP DATABASE IF EXISTS dictdb;
+DROP TABLE dictdb.table_for_dict;
+DROP DICTIONARY dictdb.dict_exists;
+DROP DATABASE dictdb;