Small fixes for scan rework

- set recursive setting to off if content dir points to a file
(can happen when scan menu is opened after a playlist refresh)
- fix a crash that can also happen when scan menu is opened after playlist refresh

Author: zoltanvb

manual_content_scan.c

@@ -1290,7 +1290,10 @@ bool manual_content_scan_get_task_config(
       return false;
 
    if (!path_is_directory(scan_settings.content_dir))
+   {
       scan_settings.scan_single_file = true;
+      scan_settings.search_recursively = false;
+   }
    else
       scan_settings.scan_single_file = false;
 

menu/cbs/menu_cbs_deferred_push.c

@@ -398,7 +398,7 @@ static int general_push(menu_displaylist_info_t *info,
             if (!valid_extensions)
                valid_extensions = info->exts;
 
-            if (*valid_extensions)
+            if (valid_extensions && *valid_extensions)
             {
                CHECK_SIZE(strlen(valid_extensions) + 12);
                _len += strlcpy(newstr2 + _len, valid_extensions, size - _len);