Guard against NPE in: http://code.google.com/p/dart/issues/detail?id=815.

Guard against NPE in: http://code.google.com/p/dart/issues/detail?id=815.

BUG=
TEST=

Committed: https://code.google.com/p/dart/source/detail?r=2429

[mmendez, 2011-12-13 21:42:18]

I went ahead and added a guard for you.  However, it seems likely that
DartCompiler, line 343 is where the null originates.

[Brian Wilkerson, 2011-12-13 22:18:45]

LGTM.

I'm not sure how else libraryUnit would get to be null, or where else the NPE
could be coming from, but if you don't think that it's null here then let's not
commit this and let's add some code to help track down the real cause.

[mmendez, 2011-12-14 14:29:02]

I'll go ahead and commit it since, internally
DartCompilerMainContext.getLibraryUnit can return null if an IOError is thrown
during the parsing of the file.

DartCompilerMainContext does raise an onError event in this case.  It would be
good to double check that the editor receives and logs this error.

On 2011/12/13 22:18:45, Brian Wilkerson wrote:
> LGTM.
> 
> I'm not sure how else libraryUnit would get to be null, or where else the NPE
> could be coming from, but if you don't think that it's null here then let's
not
> commit this and let's add some code to help track down the real cause.