Apply small payload deserialize optimization

[serges147]

This case (namely with zero-length payload) was discovered during my work with the demo app, where I deliberately use special (O1Heap-based) PMR allocator for ALL dynamic allocations. It turns out that such allocator has special/corner case when payload is empty (which is a totally valid case, f.e. for an RPC service request). So, investigation of this problem also brought attention to quite useful optimization we can have during deserialization.

[sonarcloud[bot]]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
100.0% Coverage on New Code
0.0% Duplication on New Code

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