Commits on Mar 25, 2017

1. Fix context-stack when calling block-helpers on null values …

   Fixes #1319
   
   Original behaviour:
   - When a block-helper was called on a null-context, an empty object was used
     as context instead. (#1093)
   - The runtime verifies that whether the current context equals the
     last context and adds the current context to the stack, if it is not.
     This is done, so that inside a block-helper, the ".." path can be used
     to go back to the parent element.
   - If the helper is called on a "null" element, the context was added, even
     though it shouldn't be, because the "null != {}"
   
   Fix:
   - The commit replaces "null" by the identifiable "container.nullContext"
     instead of "{}". "nullContext" is a sealed empty object.
   - An additional check in the runtime verifies that the context is
     only added to the stack, if it is not the nullContext.
   
   Backwards compatibility within 4.0.x-versions:
   - This commit changes the compiler and compiled templates would not work
     with runtime-versions 4.0.0 - 4.0.6, because of the "nullContext"
     property. That's way, the compiled code reads
     "(container.nullContext || {})" so that the behavior will degrade
     gracefully with older runtime versions: Everything else will work
     fine, but GH-1319 will still be broken, if you use a newer compiler
     with a pre 4.0.7 runtime.

   

   nknapp committed Mar 25, 2017
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