Boolean canAppend in ZipClientHelper can only be false

[quilicicf]

The boolean canAppend in ZipClientHelper#handlePut is set to !zipExists and therefore can only be false.
If I understand the code, it should be set to zipExists instead.

Could you check that ?

[jlouvel]

Do you have a test case that illustrate the usage issue? The current behavior is hard to understand without some more context...