Narrow scope of variable to where it is needed

Author: freshtonic

lib/graphql/execution/executor.ex

@@ -104,8 +104,8 @@ defmodule GraphQL.Execution.Executor do
 
   defp resolve_directive(context, directives, directive_name) do
     ast = Enum.find(directives, fn(d) -> d.name.value == Atom.to_string(directive_name) end)
-    directive = apply(GraphQL.Type.Directives, directive_name, [])
     if ast do
+      directive = apply(GraphQL.Type.Directives, directive_name, [])
       %{if: val} = argument_values(directive.args, ast.arguments, context.variable_values)
       val
     else