[BUG] PHP deprecation warning when editing zone without NS records

[imyller]

fM Version : 4.6.1 fmDNS Version : 6.0.3

• Debian 12 (Bookworm)
• PHP 8.2.7
• Apache 2.4.57

In raising this issue, I confirm the following (please check boxes, eg [X]):

• [X] I have read and understood the contributors guide.
• [X] I have checked that the bug-fix I am reporting can be replicated, or that the feature I am suggesting isn't already present.
• [X] I have checked that the issue I'm posting isn't already reported.
• [X] I have checked that the issue I'm posting isn't already solved and no duplicates exist in closed issues and opened issues
• [X] I have checked the pull requests tab for existing solutions/implementations to my issue/suggestion.

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(BUG | ISSUE) Expected Behavior:

Zone is opened for edit with warning, but without PHP deprecation error.

(BUG | ISSUE) Actual Behavior:

Deprecated: explode(): Passing null to parameter #2 ($string) of type string is deprecated in /var/www/facileManager/fm-modules/fmDNS/classes/class_records.php on line 922

(BUG | ISSUE) Steps to reproduce:

• Enable Show errors in settings
• Open zone for editing (without active name servers)
• PHP deprecation warning and normal nameserver warning error pops up

[WillyXJ]

This is now fixed in fmDNS 6.0.4 and later.