How can I make this Max MSP/M4L patch update zl.len and zl.mth for an empty list?

Indeed the only way to know if there is nothing in a zl group object is to somehow keep track of whether something came in.

Here is an example that should do what you are looking for if I understand correctly:

enter image description here

----------begin_max5_patcher----------
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AVPZoXCICYBxbQ1DBlK9s6+cwB3erdUvtlS7t.zef9KzpU+X8pUvP5AVM77p
f57S6qx6foEH3+SytuErw7UR9IILrDsCUNNZYALlZdehMNlnutTTwkvagbdv
ld43nzgQMCI+2ibyBKXWt3PvFTPoPYrGFl0wb49mKEGdrkuWZlHkw1Ri1fHL
5V7FDMaq5Ap52QOn+a94505O1LMRsQI0JkTqTRtFkuGcDEcJpBYwyGbRD1VP
L5NhhSkOFk.7QG+zm70wqPXDwFigVYjYkQ16oTG+oK.SS.fCCmCfslSxVP4J
MjNmx0R6AShOJ6nI7dp5jk5CR6q2waGW9puprtuFV7j2xYzKQxi4s40bIu8Q
tHeWEf.1C9fWDy2zCDEBdfHLFxfYmUxibTJF4.+AbJ6apq45nwqh+eooWHQx
m4nm4UEHQiTsY1vjpJE785u+R9tz2QuCMB95vaJGGFBPmRFc.enf+tdorQXQ
PGg8TflbyJW2LeFm.fhGRqG+7CA50BneVsJf3oNThTKRK9hvLOE3vCpVSkWR
DHdoXOizexUUoDE7SnlmPE7txVdApaedE+SZHsAXpe.jlwtLsjjQlG.aZklT
OEmn7t8bQgZgfZZKNWH6R7R7EdX.OVHT2kjjMK3801l9iupFiBTYCJGUU1YU
gF4YBoCAP1roPGy4fXn9APgZiMlux9.XhX5cKmZt2Uqaxn+1qaRiSFJyP8Pg
yqzHz+UssSkFZ6nII2Qyd2rM.mZBZHYLjLGMyBGxz5ITng2gpj4x4LcowOro
vCFfMNaNP9XqZUfTGaQYUdgMxIdpVyP.L1bvqT7bPiRlVKe1BEjrEUkFkNip
TSH6fdaCajl32tWXlMEhimo30U4HdYqqX1BLZFiXUbwA6hSOsk23E3XNueb5
LEwTbXCB7hDuHQT8F5CmRfkLIF+6tpxK5gr4om53fchwuEvz6dmd57bc.lcE
LnmFNzjyEGEtofeo7oUsoiY.p+jA6xOXSCrD26yKWGhQfGktMw18g.uB3P5u
55mgWod7ek5tl918iqgg3M5rWUcvJYoHWVpZC77bzsEftl1yUCM9Rtokz2ol
erD0EKQ7gkHumk7.RLG7cDOYGxBXG8Ew79xNenEbww4kHTzBQDYwbcIt3690
Ui4xJzUCmjoScTFN072Hmxqx7fkXNU8KxGBQWpIoa6b5VxEuGyG6cvntFmlr
kHtTQ2G6cvHtvT7hkHmYOQlr.lNwtowSqNYlK0I8wlYiAoaaoDeXIWR3dKRl
lDyOd7671tgYC1P0D72Z.ec5l0l++RlGg1VCZ4eubb9lIj2p5SUpZRsuEVWA
mhMWYDzOdqnubPynnSYRnAag5XDcGyMf.8gu9mq+eNu4kL.
-----------end_max5_patcher-----------

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