Fix crash unlinking a stream with groups rax and no groups (#8932)

When estimating the effort for unlink, we try to compute the effort of
the first group and extrapolate.
If there's a groups rax that's empty, there'a an assertion.

reproduce:
xadd s * a b
xgroup create s bla $
xgroup destroy s bla
unlink s

1 files changed, 1 insertions, 1 deletions

diff --git a/src/lazyfree.c b/src/lazyfree.c
index a2cf2c3ed..180a4349b 100644
--- a/src/lazyfree.c
+++ b/src/lazyfree.c
@@ -109,7 +109,7 @@ size_t lazyfreeGetFreeEffort(robj *key, robj *obj) {
         /* Every consumer group is an allocation and so are the entries in its
          * PEL. We use size of the first group's PEL as an estimate for all
          * others. */
-        if (s->cgroups) {
+        if (s->cgroups && raxSize(s->cgroups)) {
             raxIterator ri;
             streamCG *cg;
             raxStart(&ri,s->cgroups);