Merge "Bug 1871504: export-check variable is not empty before using in foreach"

htdocs/export/leap/lib.php

@@ -277,6 +277,7 @@ class PluginExportLeap extends PluginExport {
         ON b.name = bi.blocktype
         WHERE view = ?',
         array($viewid));
+        if ($blocktypes) {
             foreach ($blocktypes as $blocktype) {
                 $classname = 'LeapExport' . $blocktype->blocktype;
                 if (class_exists($classname) && method_exists($classname, 'get_blocktype_export_data')) {
@@ -284,6 +285,7 @@ class PluginExportLeap extends PluginExport {
                 }
             }
         }
+    }
 
     /**
      * Export the views