Adam Barth 7f0a28952a Uncaught exceptions get two stack traces
Now we print Dart_GetError only when we don't have a stack trace. Also, improve
the usability of the sky_shell command line tool by defaulting to "packages"
for the package-root and not crashing when we don't have a package-root until
we actually try to load a package. Finally, remove console spam when we fail to
bind the observatory port.

Fixes #689
2015-08-20 12:09:53 -07:00
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