evalvar() records empty expansion results (varlen == 0) as string
regions that need to be scanned for IFS characters. This is pointless,
because there is nothing to split.

This patch fixes the bug that, given no positional parameters, unquoted
$@ and $* incorrectly generate one empty field (they should generate no
fields). Apparently that was a side effect of the above.

- M.

diff --git a/src/expand.c b/src/expand.c
index 705fef7..03a9b0c 100644
--- a/src/expand.c
+++ b/src/expand.c
@@ -771,7 +771,7 @@ vsplus:
        if (subtype == VSNORMAL) {
-               if (!easy)
+               if (!easy || varlen == 0)
                        goto end;
                recordregion(startloc, expdest - (char *)stackblock(), quoted);
                goto end;

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