Suggestion when csv upload fails

Hi, thank you for great plugin. It saved my time.

When using the plugin at first, I had failed uploading but there were no detailed error message shown. I modified the code to display the reason of failure, then I could take work-around (split csv files into smaller, to avoid upload_max_filesize limit).

So, I want to share my patch. Hope if the author also finds and takes it in.

csv_importer.php line 182

if (empty($_FILES['csv_import']['tmp_name'])) {
			// these messages are from PHP manual's comment
			static $file_upload_error_messages = array(
				1=>'The uploaded file exceeds the upload_max_filesize directive in php.ini.',
				'The uploaded file exceeds the MAX_FILE_SIZE directive that was specified in the HTML form.',
				'The uploaded file was only partially uploaded.',
				'No file was uploaded.',
				6=>'Missing a temporary folder.',
				'Failed to write file to disk.',
				'A PHP extension stopped the file upload.'
			);

            $this->log['error'][] = 'No file uploaded, aborting. ['
				. $file_upload_error_messages[$_FILES['csv_import']['error']]
				. ']';
            $this->print_messages();
            return;
        }

https://wordpress.org/plugins/csv-importer/