Werk #12985: Local Checks: Make Min/Max Values Truly Optional

As stated in the documentation, min/max values are optional in the output of local checks. However, this was not fully implemented. Omitting min/max values in the output, i.e. a=5;3:7;2:8, worked, but empty values such as a=5;3:7;2:8;;, resulted in ValueError: could not convert string to float: '' on the Checkmk server.

This has been fixed.

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