Werk #11903: Fix crash in hearbeat CRM general
| Component | Checks & agents |
| Title | Fix crash in hearbeat CRM general |
| Date | Feb 1, 2021 |
| Checkmk Edition | Checkmk Raw (CRE) |
| Checkmk Version | 1.6.0p21 2.0.0b6 2.1.0b1 |
| Level | Trivial Change |
| Class | Bug Fix |
| Compatibility | Compatible - no manual interaction needed |
Fix cases where the Heartbeat CRM would crash with a TypeError.
