GEO FROMMEMBER returns error when member does not exist

Redis will return a specific error if the member does not exist,
but Kvrocks currently handles it as if the src key does not exist:
```
127.0.0.1:6666> geoadd src 10 10 Shenzhen
(integer) 1
127.0.0.1:6666> GEOSEARCHSTORE dst src FROMMEMBER Shenzhen_2 BYBOX 88 88 m
(integer) 0

127.0.0.1:6379> GEOADD src 10 10 Shenzhen
(integer) 1
127.0.0.1:6379> GEOSEARCHSTORE dst src FROMMEMBER Shenzhen_2 BYBOX 88 88 m
(error) ERR could not decode requested zset member
```

Now we will return an error, the error message is the same
as Redis: could not decode requested zset member
```
127.0.0.1:6666> GEOSEARCHSTORE dst src FROMMEMBER Shenzhen_2 BYBOX 88 88 m
(error) ERR Invalid argument: could not decode requested zset member

127.0.0.1:6666> GEORADIUSBYMEMBER src Shenzhen_2 20 M STORE dst
(error) ERR Invalid argument: could not decode requested zset member
```

src/types/redis_geo.cc

@@ -188,7 +188,7 @@ rocksdb::Status Geo::Get(const Slice &user_key, const Slice &member, GeoPoint *g
 
   auto iter = geo_points.find(member.ToString());
   if (iter == geo_points.end()) {
-    return rocksdb::Status::NotFound();
+    return rocksdb::Status::InvalidArgument("could not decode requested zset member");
   }
   *geo_point = iter->second;
   return rocksdb::Status::OK();

tests/gocase/unit/geo/geo_test.go

@@ -136,6 +136,18 @@ func TestGeo(t *testing.T) {
 		require.EqualValues(t, []interface{}([]interface{}{}), rdb.Do(ctx, "GEORADIUSBYMEMBER_RO", "points", "member", "1", "km").Val())
 	})
 
+	t.Run("GEORADIUSBYMEMBER against non existing member", func(t *testing.T) {
+		require.NoError(t, rdb.Do(ctx, "DEL", "src", "dst").Err())
+
+		require.NoError(t, rdb.Do(ctx, "GEOADD", "src", "10", "10", "Shenzhen").Err())
+		require.Error(t, rdb.Do(ctx, "GEORADIUSBYMEMBER", "src", "Shenzhen_2", 20, "M").Err())
+
+		require.NoError(t, rdb.Do(ctx, "GEOADD", "dst", "20", "20", "Guangzhou").Err())
+		require.Error(t, rdb.Do(ctx, "GEORADIUSBYMEMBER", "src", "Shenzhen_2", 20, "M", "STORE", "dst").Err())
+		// Verify command does not affect dst
+		require.EqualValues(t, 1, rdb.Exists(ctx, "dst").Val())
+	})
+
 	t.Run("GEORADIUSBYMEMBER store: remove the dst key when there is no result set", func(t *testing.T) {
 		require.NoError(t, rdb.Do(ctx, "DEL", "src", "dst").Err())
 
@@ -244,6 +256,18 @@ func TestGeo(t *testing.T) {
 		require.EqualValues(t, 0, rdb.Do(ctx, "GEOSEARCHSTORE", "dst", "src", "FROMMEMBER", "Shenzhen", "BYBOX", 88, 88, "m").Val())
 	})
 
+	t.Run("GEOSEARCH / GEOSEARCHSTORE FROMMEMBER against non existing member", func(t *testing.T) {
+		require.NoError(t, rdb.Do(ctx, "DEL", "src", "dst").Err())
+
+		require.NoError(t, rdb.Do(ctx, "GEOADD", "src", "10", "10", "Shenzhen").Err())
+		require.Error(t, rdb.Do(ctx, "GEOSEARCH", "src", "FROMMEMBER", "Shenzhen_2", "BYBOX", 88, 88, "M").Err())
+
+		require.NoError(t, rdb.Do(ctx, "GEOADD", "dst", "20", "20", "Guangzhou").Err())
+		require.Error(t, rdb.Do(ctx, "GEOSEARCHSTORE", "dst", "src", "FROMMEMBER", "Shenzhen_2", "BYBOX", 88, 88, "M").Err())
+		// Verify command does not affect dst
+		require.EqualValues(t, 1, rdb.Exists(ctx, "dst").Val())
+	})
+
 	t.Run("GEOSEARCHSTORE remove the dst key when there is no result set", func(t *testing.T) {
 		require.NoError(t, rdb.Do(ctx, "del", "src", "dst").Err())