By alex_b fix notice when setting on CSV parser is empty

plugins/FeedsCSVParser.inc

@@ -20,7 +20,7 @@ class FeedsCSVParser extends FeedsParser {
     $parser->setDelimiter($delimiter);
 
     $iterator = new ParserCSVIterator($fetcher_result->getFilePath());
-    if ($source_config['no_headers'] < 1) {
+    if (empty($source_config['no_headers'])) {
       // Get first line and use it for column names, convert them to lower case.
       $header = $this->parseHeader($parser, $iterator);
       if (!$header) {