Checkmk Werk 15768: siemens_plc_duration: Fix crash if duration is smaller than a second

ID: 15768 Title: siemens_plc_duration: Fix crash if duration is smaller than a second Component: Checks & agents Level: 1 Class: Bug fix Version: 2.1.0p30 Previously, siemens_plc_duration check would crash if duration was smaller than a second with an error: C+: ValueError (invalid literal for int() with base 10: '0.05000000074505806') C-: Now, the check doesn't crash anymore and it's possible to input thresholds smaller than a second in the "Siemens PLC Duration" monitoring rule.