fix ZRANGESTORE - should return 0 when src points to an empty key (#9089)

mistakenly it used to return an empty array rather than 0.

Co-authored-by: Oran Agra <oran@redislabs.com>
(cherry picked from commit 95274f1f8a3ef4cb4033beecfaa99ea1439ed170)

src/t_zset.c

@@ -3663,7 +3663,12 @@ void zrangeGenericCommand(zrange_result_handler *handler, int argc_start, int st
         lookupKeyWrite(c->db,key) :
         lookupKeyRead(c->db,key);
     if (zobj == NULL) {
+        if (store) {
+            handler->beginResultEmission(handler);
+            handler->finalizeResultEmission(handler, 0);
+        } else {
             addReply(c, shared.emptyarray);
+        }
         goto cleanup;
     }
 

tests/unit/type/zset.tcl

@@ -1568,6 +1568,19 @@ start_server {tags {"zset"}} {
         r zrange z1 5 0 BYSCORE REV LIMIT 0 2 WITHSCORES
     } {d 4 c 3}
 
+    test {ZRANGESTORE - src key missing} {
+        set res [r zrangestore z2{t} missing{t} 0 -1]
+        assert_equal $res 0
+        r exists z2{t}
+    } {0}
+
+    test {ZRANGESTORE - src key wrong type} {
+        r zadd z2{t} 1 a
+        r set foo{t} bar
+        assert_error "*WRONGTYPE*" {r zrangestore z2{t} foo{t} 0 -1}
+        r zrange z2{t} 0 -1
+    } {a}
+
     test {ZRANGESTORE - empty range} {
         set res [r zrangestore z2 z1 5 6]
         assert_equal $res 0