feat（新功能）:

fix（修复bug）:   增强design 选区数据结构判断
docs（文档变更）:
refactor（重构）:
test(增加测试):

app/service/design_fast/pipeline/print_painting.py

@@ -15,7 +15,7 @@ class PrintPainting:
         single_print = result['print']['single']
         overall_print = result['print']['overall']
         element_print = result['print']['element']
-        partial_path = result['print']['partial']
+        partial_path = result['print']['partial'] if 'partial' in result['print'] else None
         result['single_image'] = None
         result['print_image'] = None
         # TODO 给result['pattern_image'] resize 到resize_scale的大小