Not possible to select group in Monitoring->Overview screen if hosts in the host group doesn't have triggers.

Regression, broken after implementation of ZBX-5429:
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r29850 | eduards | 2012-08-27 11:45:13 +0300 (Mon, 27 Aug 2012) | 1 line

..F....... ZBX-5429 fixed hintbox displaying when menu is shown
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