Work around issue 15920 in pkg/stack_trace.

pkg/stack_trace/lib/src/trace.dart

Index: pkg/stack_trace/lib/src/trace.dart
diff --git a/pkg/stack_trace/lib/src/trace.dart b/pkg/stack_trace/lib/src/trace.dart
index 88b9275182b64262268c3a2c6ba892ad99754e66..45cb42c757a2e295631b8ce5d7d91c1c49c851f0 100644
--- a/pkg/stack_trace/lib/src/trace.dart
+++ b/pkg/stack_trace/lib/src/trace.dart
@@ -126,7 +126,10 @@ class Trace implements StackTrace {
 
   /// Parses a string representation of a Dart VM stack trace.
   Trace.parseVM(String trace)
-      : this(trace.trim().split("\n").map((line) => new Frame.parseVM(line)));
+      : this(trace.trim().split("\n").
+            // TODO(nweiz): remove this when issue 15920 is fixed.
+            where((line) => line.isNotEmpty).

[Bob Nystrom, 2014/01/06 21:42:49]

Should you trim the line first in case it contains only whitespace?

[nweiz, 2014/01/06 23:59:27]

I'm pretty sure that in practice the blank lines produced by the VM never have
any whitespace. Since this code just exists to work around those, I don't think
it's necessary.

+            map((line) => new Frame.parseVM(line)));
 
   /// Parses a string representation of a Chrome/V8 stack trace.
   Trace.parseV8(String trace)