Fix typo resulting in exception in weblog-model.getweblogparameters when database does not exist

weblog-model.lua

@@ -1189,7 +1189,7 @@ function mymodule.getweblogparameters(self, clientdata)
 		databasedisconnect()
 	end)
 	if err and not res then
-		result.source.errtxt = err
+		result.sourcename.errtxt = err
 	end
 
 	return cfe({ type="group", value=result, label="Weblog Access Log" })