Fix count_questions when no attribute is set for a question #332

Job	Run time
Lint	1m 2s
Test dev setup on ubuntu-latest	49s
Test installation of all dependencies	1m 28s
Test dev setup on windows-latest	2m 1s
Test dev setup on macos-latest	45s
Test (Python: 3.8, DB: mysql)	24m 28s
Test (Python: 3.8, DB: postgres)	22m 33s
Test (Python: 3.12, DB: mysql)	28m 54s
Test (Python: 3.12, DB: postgres)	32m 4s
Build python wheel	1m 21s
Indicate completion to coveralls	19s
required-checks-pass	2s
	1h 55m 46s

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