terraform: make sure the config is initialized

terraform/graph.go

@@ -201,6 +201,7 @@ func graphAddConfigResources(
 					Resource: &Resource{
 						Id:     name,
 						State:  state,
+						Config: NewResourceConfig(r.RawConfig),
 					},
 				},
 			}
@@ -431,6 +432,7 @@ func graphAddOrphans(g *depgraph.Graph, c *config.Config, s *State) {
 				Resource: &Resource{
 					Id:     k,
 					State:  rs,
+					Config: NewResourceConfig(nil),
 				},
 			},
 		}

terraform/resource.go

@@ -135,8 +135,11 @@ func (c *ResourceConfig) interpolate(ctx *Context) error {
 		}
 	}
 
+	if c.raw != nil {
 		c.ComputedKeys = c.raw.UnknownKeys()
 		c.Raw = c.raw.Raw
 		c.Config = c.raw.Config()
+	}
+
 	return nil
 }