fix: name 不存在

src/components/Flow/FlowNodeAvatar.vue

@@ -5,7 +5,7 @@
 		<!-- <el-avatar v-else :size="size" class="icon" :icon="UserFilled" /> -->
 		<el-avatar v-if="!avatar && !useSlots().avatar" :size="size" class="icon">
 			<template v-if="name">
-				{{ name.charAt(0) }}
+				{{ name?.charAt(0) || '-' }}
 			</template>
 			<UserFilled v-else />
 		</el-avatar>