Effen error if a component ancestor doesn't specify a style

Effen error if a component ancestor doesn't specify a style

If a component ancestor doesn't specify a style, quietly ignore it.

Currently the result is a little confusing:

[0330/124031:ERROR:dart_error.cc(20)] Unhandled exception:
Uncaught Error: The null object does not have a getter '_className'.

R=ojan@chromium.org

Committed: https://chromium.googlesource.com/external/mojo/+/b9a77c537c1202fe1e16d9819d578fe0c7ded1d8

[hansmuller1, 2015-03-30 19:58:58]

hansmuller@google.com changed reviewers:
+ rafaelw@chromium.org

[hansmuller1, 2015-03-30 19:59:11]

hansmuller@google.com changed reviewers:
+ hansmuller@google.com

[hansmuller1, 2015-03-30 19:59:12]

PTAL

[ojan, 2015-03-30 20:44:10]

ojan@chromium.org changed reviewers:
+ ojan@chromium.org

[ojan, 2015-03-30 20:44:11]

lgtm 

Raf is on leave for the next 5 weeks. This seems reasonable to me though.

https://codereview.chromium.org/1041863003/diff/1/sky/framework/fn.dart
File sky/framework/fn.dart (right):

https://codereview.chromium.org/1041863003/diff/1/sky/framework/fn.dart#newco...
sky/framework/fn.dart:442: if (parent is StyleNode  && (parent as
StyleNode).style != null)
You have two spaces after StyleNode.

[hansmuller, 2015-03-30 21:16:49]

Committed patchset #1 (id:1) manually as
b9a77c537c1202fe1e16d9819d578fe0c7ded1d8 (presubmit successful).

[rafaelw, 2015-03-31 01:24:14]

Did the case arise that a stylenode legitimately had no style? Seems like the
other option here is to make the creation of stylenode without a style an error.

[hansmuller1, 2015-03-31 14:49:42]

On 2015/03/31 01:24:14, rafaelw wrote:
> Did the case arise that a stylenode legitimately had no style? Seems like the
> other option here is to make the creation of stylenode without a style an
error.

The Material class creates a StyleNode with a null style if the level: parameter
is 0 or unspecified. I assume that's legitimate?