http2: do not log empty objects for request or response

[catenacyber]

Link to ticket: https://redmine.openinfosecfoundation.org/issues/
https://redmine.openinfosecfoundation.org/issues/7741

Describe changes:

• http2: do not log empty objects for request or response

@jasonish should we enforce minProperties for every object in our json schema ?

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 83.68%. Comparing base (07b7f36) to head (0ed7f94).
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master   #13598      +/-   ##
==========================================
+ Coverage   83.63%   83.68%   +0.04%     
==========================================
  Files        1011     1011              
  Lines      275071   275077       +6     
==========================================
+ Hits       230050   230189     +139     
+ Misses      45021    44888     -133     

Flag	Coverage Δ
fuzzcorpus	62.77% <100.00%> (+0.11%)	⬆️
livemode	19.03% <0.00%> (+0.02%)	⬆️
pcap	44.70% <100.00%> (-0.02%)	⬇️
suricata-verify	65.06% <100.00%> (-0.01%)	⬇️
unittests	59.18% <0.00%> (-0.01%)	⬇️

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[suricata-qa]

Information: QA ran without warnings.

Pipeline = 26898

[jasonish]

@jasonish should we enforce minProperties for every object in our json schema ?

Probably a good practice to start adding, but I wouldn't jump to adding it to all items. Maybe when 9.0 opens.