Empty value on Pi-Hole

Debian9 pihole latest version
I got empty value, what cause this ?

pihole -t

That . query caused the blank spot. It may actually be a query for a blank domain, but dnsmasq puts a period there in the log.

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Sometimes I got this wired IP, I blocked it via Regex

You probably dont want to block spamhaus.org related domains if want to keep spam at bay:

https://www.spamhaus.org/organization/

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What does this mean?
I dont block spamhaus.org, why some one keep requesting IP address combination with domain? wired right? also it makes my log looks dirty though

It means if you want to keep spam out:

You do block that domain, or sub domains, as shown on your screenshot above:

pi@noads:~ $ pihole -q spamhaus.org
  [i] No results found for spamhaus.org within the block lists

You probably have software running that depends on the spamhaus.org services like for example the DNS-based Blocklists or "DNSBLs" (mentioned in link I posted before).

Nope.
Source for the queries is "localhost" (from screenshot).
"localhost" usually resolves to an IP address on the local loopback interface named "lo" so its not one of the wired interfaces but most likely a process running locally:

pi@noads:~ $ host localhost
localhost has address 127.0.0.1
localhost has IPv6 address ::1

pi@noads:~ $ ip a
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
       valid_lft forever preferred_lft forever
    inet6 ::1/128 scope host
       valid_lft forever preferred_lft forever
[..]

i do not block spamhaus.org ~~
Nvm, I don't want other users keep doing unnecessary request to my server
will drop all other request <ip address>.zen.spamhaus.org

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