Disable add option button when input is empty

Signed-off-by: don9x2E <revan@kakao.com>

Author: don9x2E

src/components/Questions/AnswerInput.vue

@@ -68,7 +68,7 @@
 			<NcButton
 				:aria-label="t('forms', 'Add a new answer option')"
 				variant="tertiary"
-				:disabled="isIMEComposing"
+				:disabled="isIMEComposing || !canCreateLocalAnswer"
 				@click="createLocalAnswer">
 				<template #icon>
 					<IconPlus :size="20" />