Add if (name.empty() || name == " ") check for publish layer

SpCloudMain/SpCloudMain.cpp

@@ -50,6 +50,13 @@ int main()
 
 			std::string user_id = req.get_file_value("UserId").content;
 			std::string name = req.get_file_value("Name").content;
+			if (name.empty() || name == " ")
+			{
+				res.set_content("Select another app name", "text/plain");
+
+				return;
+			}
+
 			ranges::transform(name, name.begin(), [](unsigned char c) { return std::tolower(c); });
 			std::string target = req.get_file_value("Target").content;
 			std::string authorization_token = req.get_header_value("Authorization");