Merge branch 'feature/manage-null-reference' of https://github.com/Ca… #593

Job	Run time
Coding Standard & Static Analysis	2m 32s
testsuite (7.4, sqlite)	22s
testsuite (7.4, mysql)	38s
testsuite (7.4, pgsql)	26s
testsuite (8.0, sqlite)	28s
testsuite (8.0, mysql)	34s
testsuite (8.0, pgsql)	28s
testsuite (8.1, sqlite)	35s
testsuite (8.1, mysql)	45s
testsuite (8.1, pgsql)	34s
testsuite (8.2, sqlite)	30s
testsuite (8.2, mysql)	42s
testsuite (8.2, pgsql)	26s
testsuite (8.3, sqlite)	27s
testsuite (8.3, mysql)	38s
testsuite (8.3, pgsql)	31s
	10m 36s

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