check existsing in publish.cmd

build/publish.cmd

@@ -23,7 +23,7 @@ move dist\Azaion.Dataset.dll dist\dummy\
 echo Build Cython app
 cd Azaion.Inference
 echo remove dist folder:
-rmdir dist /s /q
+if exist dist rmdir dist /s /q
 
 echo install python and dependencies
 python -m venv venv
@@ -74,8 +74,10 @@ cd..
 
 echo Download onnx model
 cd build
+if not exist cdn_manager.exe (
     echo Install cdn_manager
     call build_cdn_manager
+)
 
 call cdn_manager.exe download models
 move models ..\dist\