Patched map file is saved although access rights are wrong

[jirik]

Steps to reproduce:

• POST Workspace Map in private workspace A with r/w access to EVERYONE
• User B sends PATCH of the same map with another file and r/w access set to user B; Layman returns error 43 "Owner of the personal workspace have to keep write right."
• call GET Workspace Map File by user B

Expected behavior:

• Returned file is the original posted file

Actual behavior:

• Returned file is the new patched file. Also, some keys, e.g. name, can be missing

It probably happens also for layers.