Fix -wreturn-type warnings

cli.cpp

@@ -75,10 +75,7 @@ std::pair<bool, std::string> CLIHandler::user_change_pw([[maybe_unused]] const s
 
 		userDao->save(*user);
 	}
-	else
-	{
-		return {false, "User not found"};
-	}
+	return {false, "User not found"};
 }
 
 std::pair<bool, std::string> CLIHandler::user_rename([[maybe_unused]] const std::vector<std::string> &args)

database/categorydaosqlite.cpp

@@ -42,6 +42,7 @@ std::optional<Category> CategoryDaoSqlite::find(std::string name)
 	{
 		throwFrom(e);
 	}
+	return {};
 }
 
 void CategoryDaoSqlite::save(const Category &c)

database/sqlitedao.cpp

@@ -22,18 +22,17 @@ SOFTWARE.
 
 bool SqliteDao::execBool(sqlite::database_binder &binder) const
 {
-	bool result;
+	bool result = false;
 	try
 	{
-		bool result;
 		binder >> result;
-		return result;
 	}
 	catch(sqlite::sqlite_exception &e)
 	{
 		// TODO: well, we may want to check whether rows have found or not and thus log this here
-		return false;
+		result = false;
 	}
+	return result;
 }
 
 int SqliteDao::execInt(sqlite::database_binder &binder) const
@@ -52,4 +51,5 @@ int SqliteDao::execInt(sqlite::database_binder &binder) const
 	{
 		throwFrom(e);
 	}
+	return 0;
 }

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)