fix(types): refine draw component typing

Signed-off-by: Vitor Mattos <1079143+vitormattos@users.noreply.github.com>

Author: vitormattos

src/components/Draw/Draw.vue

@@ -115,7 +115,10 @@ function close() {
 	emit('close')
 }
 
-async function save(base64: string) {
+async function save(base64: string | null) {
+	if (!base64) {
+		return
+	}
 	signatureElementsStore.loadSignatures()
 	await signatureElementsStore.save(props.type, base64)
 	emit('save')