REPORT-78881【迭代】【起始页】先选择一个会失败的工作目录，再选择本地目录启动，预览模板失败

添加验证方案，确认有效值

designer-base/src/main/java/com/fr/start/common/DesignerStartupContext.java

@@ -141,7 +141,12 @@ public class DesignerStartupContext {
     
         String curEnvName = DesignerEnvManager.getEnvManager().getCurEnvName();
         DesignerWorkspaceInfo workspaceInfo = DesignerEnvManager.getEnvManager().getWorkspaceInfo(curEnvName);
-        return workspaceInfo.getType() == DesignerWorkspaceType.Local;
+        boolean valid = false;
+        try {
+            valid = workspaceInfo.checkValid();
+        } catch (Exception ignore) {
+        }
+        return workspaceInfo.getType() == DesignerWorkspaceType.Local && valid;
     }
     
     public void setStartupPageModel(StartupPageModel startupPageModel) {