Werk #17350: ps_section: Prevent ps crash on empty section

Component	Checks & agents
Title	ps_section: Prevent ps crash on empty section
Date	May 5, 2025
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	2.5.0b1 Checkmk Community, Checkmk Pro, Checkmk Ultimate, Checkmk Cloud, Checkmk Ultimate MT 2.4.0p3 Checkmk Community, Checkmk Pro, Checkmk Ultimate, Checkmk Cloud, Checkmk Ultimate MT

With this change, ps section doesn't crash if the StringTable is empty. In this case, ps parser returns None to prevent any unnecessary crash if something fails in the agent.

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