Werk #16056: Fix error on showing open bulk notifications

Component	Notifications
Title	Fix error on showing open bulk notifications
Date	Sep 11, 2023
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	2.3.0b1 Checkmk Community, Checkmk Pro, Checkmk Ultimate, Checkmk Ultimate MT 2.2.0p10 Checkmk Community, Checkmk Pro, Checkmk Ultimate, Checkmk Ultimate MT

If the option "Show bulks" was used on the notification configuration page, an error like "Internal error: could not convert string to float 'n.a.'" could occur.

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