Also use safe_load on YAML::Store

Author: hsbt

lib/yaml/store.rb

@@ -69,8 +69,8 @@ def dump(table)
   end
 
   def load(content)
-    table = YAML.respond_to?(:unsafe_load) ? YAML.unsafe_load(content) : YAML.load(content)
-    if table == false
+    table = YAML.respond_to?(:safe_load) ? YAML.safe_load(content, permitted_classes: [Symbol]) : YAML.load(content)
+    if table == false || table == nil
       {}
     else
       table