Werk #6235: check_mk-if.php: fixed errors arising with php7.1

Component User interface
Title check_mk-if.php: fixed errors arising with php7.1
Date Jun 25, 2018
Level Trivial Change
Class Bug Fix
Compatibility Compatible - no manual interaction needed
Checkmk versions & editions
1.4.0p35 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME)

The default php template for most interface checks did not work, because of some newly introduced non-numeric value encountered warnings, brought by php7.1.

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