[BUGFIX lts] ember-template-compiler & fastboot compatibility

[billybonks]

Problem

When importing ember-template-compiler as part of the dist bundle, it's initializer for DOM Templates
comes along as well.

While this would normally just be extra bytes for no reason when used in conjunction with FastBoot.
It throws a document is undefined error within the bootstrap module.

Patch

If no context is passed to the bootstrap module it throws the aforementioned error, The initializer does check if the current context has a dom but just uses it to set up the context, but a dom instance would not have existed when entering the bootstrap module.

For this, my patch solution would be to only call the bootstrap if a document instance is present.

Moving forward

I would love to get some thoughts on the future of the bootstrap module and this initializer :).

[rwjblue]

Ultimately, we should deprecate this whole bootstrap thing (who even uses this any more !?!?!!?), but this patch looks great to me. Thanks for doing it!

[billybonks]

Thanks for the speedy review.

i had the same though, honestly i was surprised to see techniques as old as this still around. is it something we can start now? the way that comes to me would be to put a deprecation warning in it and include have a flag to skip the entire initializer? let me know, if you have a better approach i would enjoy raising a pr to start the process.