HPCC-31993 Fix jptree hasProp leak #8897

Job	Run time
Check Skip	15s
Build Docker (ubuntu-22.04, k8s, true, schedule)	13s
Build Docker (ubuntu-22.04, schedule)	12s
Build Bare Metal (ubuntu-20.04, mono, sudo, -DCMAKE_BUILD_TYPE=RelWithDebInfo -DINCLUDE_PLUGINS=O...	3s
Build Docker (ubuntu-20.04, schedule)	11s
Build Bare Metal (ubuntu-22.04, mono, sudo, -DCMAKE_BUILD_TYPE=RelWithDebInfo -DINCLUDE_PLUGINS=O...	21m 27s
Build Docker (centos-8, schedule)	13s
Build Bare Metal (windows-2019, -T host=x64 -A x64 -DUSE_OPTIONAL=OFF -DCLIENTTOOLS_ONLY=ON -DUSE...	4s
Build Docker (centos-7, pull_request)	37m 18s
Build Bare Metal (windows-2022, -T host=x64 -A x64 -DUSE_OPTIONAL=OFF -DCLIENTTOOLS_ONLY=ON -DUSE...	14m 10s
Build Docker (amazonlinux, schedule)	1m 14s
Build Bare Metal (macos-11, mono, sudo, -DCMAKE_BUILD_TYPE=Release -DUSE_OPTIONAL=OFF -DCLIENTTOO...	4s
Build Docker (centos-7, LN, true, schedule)	1m 34s
Build Bare Metal (macos-12, mono, sudo, -DCMAKE_BUILD_TYPE=Release -DUSE_OPTIONAL=OFF -DCLIENTTOO...	8m 59s
	1h 25m 57s

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