Fix parseStatements failure propagation and executor cleanup #688

Job	Run time
Gradle Check (ubuntu-latest)	2m 29s
Gradle Check (macos-latest)	2m 55s
Gradle Check (windows-latest)	4m 49s
Maven Verify (macos-latest)	3m 33s
Maven Verify (ubuntu-latest)	2m 33s
Maven Verify (windows-latest)	3m 14s
Gradle Publish (Maven Central)	-1s
Build & Deploy Sphinx Docs	-1s
	19m 31s

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