fix ci script

Author: pmp-p

.github/workflows/ci.yml

@@ -50,7 +50,7 @@ jobs:
 
     - name: Clean up
       run: |
-        rm /tmp/sdk/emsdk.tar
+        [ -f /tmp/sdk/emsdk.tar ] && rm /tmp/sdk/emsdk.tar
 
     - name: Upload sdk to Github artifacts
       uses: actions/[email protected]