FIX Allow non-multi TagField to be cleared #145

Job	Run time
CI / Context	4s
CI / Generate matrix	14s
CI / Check governance	2s
CI / 8.2 mariadb phpunit all	2m 2s
CI / 8.3 mysql84 phpunit all	2m 17s
CI / 8.1 mysql57 doclinting	3m 0s
CI / 8.1 mysql57 js	4m 33s
CI / 8.1 mysql57 phplinting	2m 16s
CI / 8.1 prf-low mysql57 phpunit all	2m 1s
CI / 8.3 mysql80 phpunit all	2m 21s
CI / Dispatch tag patch release	0s
	18m 50s

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