kernel status flags should be suppressed

On osx:

$ python ntpq/ntpq -c kerninfo -D 4
ntpq: numeric-mode lookup of localhost failed, nodename nor servname provided, or not known
Opening host localhost
Sending 168 octets

Request packet:
16 02 00 01 00 00 00 00 00 00 00 9b 6b 6f 66 66 ............koff
73 65 74 2c 6b 66 72 65 71 2c 6b 6d 61 78 65 72 set,kfreq,kmaxer
72 2c 6b 65 73 74 65 72 72 2c 6b 73 74 66 6c 61 r,kesterr,kstfla
67 73 2c 6b 74 69 6d 65 63 6f 6e 73 74 2c 6b 70 gs,ktimeconst,kp
72 65 63 69 73 2c 6b 66 72 65 71 74 6f 6c 2c 6b recis,kfreqtol,k
70 70 73 66 72 65 71 2c 6b 70 70 73 73 74 61 62 ppsfreq,kppsstab
2c 6b 70 70 73 6a 69 74 74 65 72 2c 6b 70 70 73 ,kppsjitter,kpps
63 61 6c 69 62 64 75 72 2c 6b 70 70 73 63 61 6c calibdur,kppscal
69 62 73 2c 6b 70 70 73 6a 69 74 65 78 63 2c 6b ibs,kppsjitexc,k
70 70 73 73 74 62 65 78 63 2c 6b 70 70 73 63 61 ppsstbexc,kppsca
6c 69 62 65 72 72 73 00                         liberrs.
Received 220 octets
Got packet, size = 220
Packet okay
Response packet:
6b 6f 66 66 73 65 74 3d 30 2c 20 6b 66 72 65 71 koffset=0, kfreq
3d 30 2c 20 6b 6d 61 78 65 72 72 3d 30 2c 20 6b =0, kmaxerr=0, k
65 73 74 65 72 72 3d 30 2c 20 6b 73 74 66 6c 61 esterr=0, kstfla
67 73 2c 20 6b 74 69 6d 65 63 6f 6e 73 74 3d 30 gs, ktimeconst=0
2c 0d 0a 6b 70 72 65 63 69 73 3d 30 2c 20 6b 66 ,..kprecis=0, kf
72 65 71 74 6f 6c 3d 30 2c 20 6b 70 70 73 66 72 reqtol=0, kppsfr
65 71 3d 30 2c 20 6b 70 70 73 73 74 61 62 3d 30 eq=0, kppsstab=0
2c 20 6b 70 70 73 6a 69 74 74 65 72 3d 30 2c 0d , kppsjitter=0,.
0a 6b 70 70 73 63 61 6c 69 62 64 75 72 3d 30 2c .kppscalibdur=0,
20 6b 70 70 73 63 61 6c 69 62 73 3d 30 2c 20 6b  kppscalibs=0, k
70 70 73 63 61 6c 69 62 65 72 72 73 3d 30 2c 20 ppscaliberrs=0, 
6b 70 70 73 6a 69 74 65 78 63 3d 30 2c 0d 0a 6b kppsjitexc=0,..k
70 70 73 73 74 62 65 78 63 3d 30 0d 0a          ppsstbexc=0..
associd=0 status=0615 leap_none, sync_ntp, 1 event, clock_sync,
pll offset:            0
pll frequency:         0
maximum error:         0
estimated error:       0
kernel status:         
pll time constant:     0
precision:             0
frequency tolerance:   0
pps frequency:         0
pps stability:         0
pps jitter:            0
calibration interval   0
calibration cycles:    0
jitter exceeded:       0
stability exceeded:    0
calibration errors:    0

In classic, this line is elided since kstflags has no value at all and NTP_STR that have a zero length value are skipped entirely.