[GemStone] Do not pass bindings for variables that are only written

[chisandrei]

In GemStone snippets we should not pass bindings for variables if the variable is just written in the snippet. Can cause issues in case the session disconnects as passing a proxy from an previous session will cause an error.

We create a proxy and disconnect the session:

When we run again we get an error

We pass the old objects proxy in the bindings we get an error: