fix variable scope

__init__.py

@@ -16,8 +16,8 @@ class RunScriptSkill(MycroftSkill):
         self.read_scripts_dir()
 
     def read_scripts_dir(self):
-        if os.path.isdir(self.script_dir):
-            self.scripts = os.listdir(script_dir)
+        if self.script_dir and os.path.isdir(self.script_dir):
+            self.scripts = os.listdir(self.script_dir)
         else:
             self.log.critical("The script_dir directory does not exist or can't be read")
             self.scripts = []

settingsmeta.json

@@ -6,7 +6,7 @@
         "name": "script_dir",
         "type": "text",
         "label": "Directory containing scripts",
-        "value": "/home/pi/scripts"
+        "value": "/home/mycroft/scripts"
       }]
     }]
   }