Don't swallow fatal errors in OperatorZipIterable

Author: zsxwing

src/main/java/rx/internal/operators/OperatorZipIterable.java

@@ -59,6 +59,7 @@ public void onCompleted() {
             @Override
             public void onError(Throwable e) {
                 if (done) {
+                    Exceptions.throwIfFatal(e);
                     return;
                 }
                 done = true;