[core] Hue doesn't let owners share document/directory if somebody else has a file there

Hue doesn't let owners share document/directory if somebody else has a file there

Steps to reproduce:

• User1 (not an admin) creates a directory X and shares to user2.
• User2 creates a document or directory Y inside X.
• User1 now tries to share a directory to User3

This will fail with the error

"There was an error processing your action: Failed to share document: Failed to share document: Document does not exist or you don't have the permission to access it."

Issue is not reproducible if User1 is an admin in Hue.