Issue #2190551 by twistor: Hook_feeds_before_import only executes during form submission.

includes/FeedsSource.inc

@@ -238,7 +238,6 @@ class FeedsSource extends FeedsConfigurable {
    *   method may throw the same exceptions as FeedsSource::import().
    */
   public function startImport() {
-    module_invoke_all('feeds_before_import', $this);
     $config = $this->importer->getConfig();
     if ($config['process_in_background']) {
       $this->startBackgroundJob('import');
@@ -363,6 +362,7 @@ class FeedsSource extends FeedsConfigurable {
     try {
       // If fetcher result is empty, we are starting a new import, log.
       if (empty($this->fetcher_result)) {
+        module_invoke_all('feeds_before_import', $this);
         $this->state[FEEDS_START] = time();
       }