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 Raw (CRE), Checkmk Enterprise (CEE), Checkmk Cloud (CCE), Checkmk MSP (CME) 2.2.0p10 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk Cloud (CCE), Checkmk MSP (CME)

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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