优化

src/utils.ts

@@ -524,7 +524,7 @@ export function extractTemplateVariables(template: {
       vars.add(v);
     }
     for (const rule of resolveVisibilityRules(elem)) {
-      const name = rule.variable.trim();
+      const name = (rule.variable ?? '').trim();
       if (name) vars.add(name);
     }
   }
@@ -539,7 +539,7 @@ export function getUsedTemplateVariables(template: { elements: TemplateElement[]
       vars.add(v);
     }
     for (const rule of resolveVisibilityRules(elem)) {
-      const name = rule.variable.trim();
+      const name = (rule.variable ?? '').trim();
       if (name) vars.add(name);
     }
   }
@@ -613,7 +613,7 @@ export function resolveVisibilityRules(elem: TemplateElement): VisibilityRule[]
     return elem.visibilityRules
       .map((r) => ({
         target: r.target ?? 'variable',
-        variable: r.variable.trim(),
+        variable: (r.variable ?? '').trim(),
         operator: r.operator,
         value: r.value,
       }))
@@ -1021,7 +1021,7 @@ export function resolveElementValue(
   return applyTextDisplayAffix(core, elem);
 }
 
-/** 输出模式下条码/二维码/图片内容为空时不渲染 */
+/** 输出模式下条码/二维码/图片内容为空时不渲染（除非 showWhenContentEmpty 为 true） */
 export function isGraphicContentEmpty(
   elem: TemplateElement,
   value: string,
@@ -1029,7 +1029,9 @@ export function isGraphicContentEmpty(
 ): boolean {
   if (mode === 'design') return false;
   if (elem.type !== 'barcode' && elem.type !== 'qrcode' && elem.type !== 'image') return false;
-  return !value || !String(value).trim();
+  const empty = !value || !String(value).trim();
+  if (!empty) return false;
+  return !elem.showWhenContentEmpty;
 }
 
 // Generate columns and rows based on paper dimensions, label dimensions, gaps, and margins