Fix custom slugs not being properly imported from bitly #1302

Job	Run time
static-analysis (8.2, cs)	39s
static-analysis (8.2, stan)	52s
static-analysis (8.2, swagger:validate)	22s
unit-tests / tests (8.2)	36s
unit-tests / tests (8.3)	23s
api-tests / tests (8.2)	1m 16s
cli-tests / tests (8.2)	32s
cli-tests / tests (8.3)	46s
api-tests / tests (8.3)	1m 8s
db-tests (ms) / db-tests (8.2)	1m 0s
db-tests (maria) / db-tests (8.2)	33s
db-tests (ms) / db-tests (8.3)	56s
db-tests (mysql) / db-tests (8.2)	44s
db-tests (maria) / db-tests (8.3)	29s
db-tests (postgres) / db-tests (8.2)	39s
db-tests (mysql) / db-tests (8.3)	29s
db-tests (postgres) / db-tests (8.3)	48s
db-tests (sqlite:ci) / db-tests (8.2)	39s
db-tests (sqlite:ci) / db-tests (8.3)	27s
upload-coverage (8.2)	35s
delete-artifacts	3s
	13m 56s

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