Fix -wreturn-type warnings

database/userdaosqlite.cpp

@@ -37,7 +37,6 @@ bool UserDaoSqlite::exists(std::string username)
 
 std::optional<User> UserDaoSqlite::find(std::string username)
 {
-
 	try
 	{
 		User user;
@@ -58,6 +57,7 @@ std::optional<User> UserDaoSqlite::find(std::string username)
 	{
 		throwFrom(e);
 	}
+	return {};
 }
 
 std::optional<User> UserDaoSqlite::find(int id)
@@ -81,6 +81,7 @@ std::optional<User> UserDaoSqlite::find(int id)
 	{
 		throwFrom(e);
 	}
+	return {};
 }
 
 std::vector<User> UserDaoSqlite::list(QueryOption o)