修复了接口（小程序用户查询项目价格为null)

src/main/java/com/greenorange/promotion/controller/project/ProjectController.java

@@ -109,7 +109,7 @@ public class ProjectController {
         List<Project> projectList = commonService.findByFieldEqTargetField(Project::getIsShelves, 1, projectService);
         for (Project project : projectList) {
             BigDecimal projectPrice = projectPriceMap.get(project.getId());
-            project.setProjectPrice(projectPrice);
+            project.setProjectPrice(projectPrice == null ? BigDecimal.ZERO : projectPrice);
         }
         List<ProjectCardVO> projectCardVOS = commonService.convertList(projectList, ProjectCardVO.class);
         return ResultUtils.success(projectCardVOS);