terraform: don't panic if no state in Walk return [GH-403]

CHANGELOG.md

@@ -1,6 +1,9 @@
 ## 0.3.1 (unreleased)
 
+BUG FIXES:
 
+ * core: Remove panic case when applying with a plan that generates no
+ new state. [GH-403]
 
 ## 0.3.0 (October 14, 2014)
 

terraform/context.go

@@ -517,13 +517,13 @@ func (c *walkContext) Walk() error {
  // Likewise, if we have no resources in our state, we're done. This
  // guards against the case that we destroyed.
  mod := c.Context.state.ModuleByPath(c.Path)
+ if mod == nil {
+ return nil
+ }
  if c.Operation == walkApply {
  // On Apply, we prune so that we don't do outputs if we destroyed
  mod.prune()
  }
- if mod == nil || len(mod.Resources) == 0 {
- return nil
- }
  if len(mod.Resources) == 0 {
  mod.Outputs = nil
  return nil