[WEB-1608] fix: deleted project errors (#4820)

* dev: fix project not found error

* [WEB-1608] chore: fix no projects found logic.

---------

Co-authored-by: pablohashescobar <nikhilschacko@gmail.com>

apiserver/plane/app/views/project/base.py

@@ -240,6 +240,12 @@ class ProjectViewSet(BaseViewSet):
             )
         ).first()
 
+        if project is None:
+            return Response(
+                {"error": "Project does not exist"},
+                status=status.HTTP_404_NOT_FOUND,
+            )
+
         serializer = ProjectListSerializer(project)
         return Response(serializer.data, status=status.HTTP_200_OK)